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bust processor ?
Hi all,
I was given a "KM18G Pro" motherboard with an AthlonXP 2500 socketA (or socket462) processor the other day, being told that the mobo was shot and the processor OK. On strength of that (and having no means to test either independantly) I purchased a "KM400A + 8237" board and intended to upgrade my son's PII machine. 420 bucks later I powered it up with the following known-to-work items: 512 DDR333 memory module, 300W PSU 6gig HDD .....and nada. The machine turns on and then off again after a few seconds when jumpered to 166 FSB and turns on only when jumpered to 133 FSB. In both cases I get no signal to the monitor and (thus?) no post. The HDD spins up and CPU fan turns on. Appropos CPU fan - I'm not entirely sure how critical this is to post. It's a new fan but of PII or III calibre - if you know what I mean. Also, the manual-stated pinout for the CPU fan seems to be incorrect: with +12v in the middle, but the ground and signal wires are reversed. I doubt that bears any significance though. So, my question is the obvious - can I be sure the processor is indeed buggered ? What are the typical symptoms of a shot processor ? TIA Jona. |
#2
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On Sat, 17 Sep 2005 10:03:08 +0200, "jona"
wrote: Hi all, I was given a "KM18G Pro" motherboard with an AthlonXP 2500 socketA (or socket462) processor the other day, being told that the mobo was shot and the processor OK. On strength of that (and having no means to test either independantly) I purchased a "KM400A + 8237" board and intended to upgrade my son's PII machine. 420 bucks later I powered it up with the following known-to-work items: How did you spend 420 if you already had the CPU, bought a cheap mobo, PSU, tiny drive and only 512MB of memory? Unless you bought a $300 video card, something is amiss. 512 DDR333 memory module, 300W PSU 6gig HDD Is the PSU name-brand with at least 180, preferribly 200W of combined 3V/5V power rating? If not, it is suspect. ....and nada. The machine turns on and then off again after a few seconds when jumpered to 166 FSB and turns on only when jumpered to 133 FSB. In both cases I get no signal to the monitor and (thus?) no post. The HDD spins up and CPU fan turns on. Appropos CPU fan - I'm not entirely sure how critical this is to post. It's a new fan but of PII or III calibre - if you know what I mean. Also, the manual-stated pinout for the CPU fan seems to be incorrect: with +12v in the middle, but the ground and signal wires are reversed. I doubt that bears any significance though. If the fan spins, you've hooked it up correctly. If this heatsink is smaller, as many from the P2 or P3 era were, you may need a bigger/better heatsink. That's not the current problem though, so long as you have it installed well (such that it's making good contact with the CPU, double-check on that) the CPU certainly won't have overheated in the first few seconds of turning the system on from being cold. Some systems may turn off if the bios is set to expect a fan RPM signal, but this is generally after it has POSTed, and you'd have the option to disable such a setting. So, my question is the obvious - can I be sure the processor is indeed buggered ? What are the typical symptoms of a shot processor ? No, it is not likely that the processor is bad in general, not from your described symptoms. It may be possible considering the state of the other motherboard, though, or if you have had the CPU powered on without the heatsink on it good. I'd first suspect an inadequate power supply, and suggest taking voltage readings with a multimeter and/or swapping in another known good/adequate PSU. You might also recheck all cards, cables, etc. Then you could strip system down to bare essentials leaving only CPU, heatsink/fan, video, 1 memory module... disconnecting everything else including keyboard, mouse, cable wiring. Turn on the system by shorting the two power-on motherboard pins with a screwdriver tip. Since it seems your PSU may be marginal, I suggest leaving the board set to the slowest FSB setting until it works at that speed, THEN trying it higher. Also substitute a less-power-hungry video card if the present one is power hungry... any old PCI or low-end AGP card should suffice. Also try clearing CMOS (or pull battery for 10 minutes) while AC power is disconnected, and check the battery voltage. |
#3
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"kony" wrote in message ... On Sat, 17 Sep 2005 10:03:08 +0200, "jona" wrote: Hi all, I was given a "KM18G Pro" motherboard with an AthlonXP 2500 socketA (or socket462) processor the other day, being told that the mobo was shot and the processor OK. On strength of that (and having no means to test either independantly) I purchased a "KM400A + 8237" board and intended to upgrade my son's PII machine. 420 bucks later I powered it up with the following known-to-work items: How did you spend 420 if you already had the CPU, bought a cheap mobo, PSU, tiny drive and only 512MB of memory? Unless you bought a $300 video card, something is amiss. LOL. No, that would be 420 of *my* bucks (Namibian $'s) for the board only. That's approx 70 US$. All the other mentioned parts are those I have for testing purposes and have been used in various other setups. 512 DDR333 memory module, 300W PSU 6gig HDD Is the PSU name-brand with at least 180, preferribly 200W of combined 3V/5V power rating? If not, it is suspect. It's "brand name" for around here. In fact that very PSU is from my own machine when I replaced it with a 350W unit after adding a video capture card. It's good. ....and nada. The machine turns on and then off again after a few seconds when jumpered to 166 FSB and turns on only when jumpered to 133 FSB. In both cases I get no signal to the monitor and (thus?) no post. The HDD spins up and CPU fan turns on. Appropos CPU fan - I'm not entirely sure how critical this is to post. It's a new fan but of PII or III calibre - if you know what I mean. Also, the manual-stated pinout for the CPU fan seems to be incorrect: with +12v in the middle, but the ground and signal wires are reversed. I doubt that bears any significance though. If the fan spins, you've hooked it up correctly. Ja, this would not be the first manual I've seen with inacurate diagrams. If this heatsink is smaller, as many from the P2 or P3 era were, you may need a bigger/better heatsink. That's not the current problem though, so long as you have it installed well (such that it's making good contact with the CPU, double-check on that) the CPU certainly won't have overheated in the first few seconds of turning the system on from being cold. Some systems may turn off if the bios is set to expect a fan RPM signal, but this is generally after it has POSTed, and you'd have the option to disable such a setting. That answers my CPU fan doubt, thanks. I figured that perhaps the board detected a too low rpm and thus shut off. So, my question is the obvious - can I be sure the processor is indeed buggered ? What are the typical symptoms of a shot processor ? No, it is not likely that the processor is bad in general, not from your described symptoms. It may be possible considering the state of the other motherboard, though, or if you have had the CPU powered on without the heatsink on it good. I haven't, but maybe the previous "owner" has had the CPU powered on without h/sink & fan. I'd first suspect an inadequate power supply, and suggest taking voltage readings with a multimeter and/or swapping in another known good/adequate PSU. Unless the fact that AMD processors require a significant amount of power (they operate on 3.3v if I'm not mistaken), then the PSU is good. It has hauled my own P4 with many devices/peripherals for about a year. By that I mean one ATi Radeon 9800 agp card, two additional pci network cards, pci modem, pci IDE card and 5 IDE devices. When I added the video capture card I decided not to tempt failure and upgraded to a same-brand 350W PSU. You might also recheck all cards, cables, etc. Then you could strip system down to bare essentials leaving only CPU, heatsink/fan, video, 1 memory module... disconnecting everything else including keyboard, mouse, cable wiring. Turn on the system by shorting the two power-on motherboard pins with a screwdriver tip. I have no cards or anything else - it's using (or attempting to) the onboard vga and the 512 RAM is a single unit. In the meantime I disconnected the keyboard, HDD and mouse as well - no go. I also tried with a low-end pci vga card. Since it seems your PSU may be marginal, I suggest leaving the board set to the slowest FSB setting until it works at that speed, THEN trying it higher. Also substitute a less-power-hungry video card if the present one is power hungry... any old PCI or low-end AGP card should suffice. Also try clearing CMOS (or pull battery for 10 minutes) while AC power is disconnected, and check the battery voltage. I've tried that and now I think I'll resort to ripping my sister's AMD processor out of her machine just to get some sort of clarity on the issue. It might just turn out that I now have two perfectly good AMD socketA boards and no processors. Thanks for your input. |
#4
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On Sat, 17 Sep 2005 16:27:53 +0200, "jona"
wrote: Is the PSU name-brand with at least 180, preferribly 200W of combined 3V/5V power rating? If not, it is suspect. It's "brand name" for around here. In fact that very PSU is from my own machine when I replaced it with a 350W unit after adding a video capture card. It's good. I can presume that means it "works" in general, but we don't know what your own machine was, whether that qualifies it for this different system. Even similar system (total load) can vary these days since some may draw a more balanced amperage from both 5V and 12V rails, while older era Athlon XP platforms do not. KM400 based boards were among the last that, in general (most of them), didn't use 12V for CPU power, rather 5V rail still. That answers my CPU fan doubt, thanks. I figured that perhaps the board detected a too low rpm and thus shut off. It's possible still, though it should POST immedately when you turn it on and then seconds later shut off. It can't do that at first as the fans can't be presumed to be at max RPM yet by the time the system (would have) already started POSTing and displaying the video card then motherboard bios. So, my question is the obvious - can I be sure the processor is indeed buggered ? What are the typical symptoms of a shot processor ? No, it is not likely that the processor is bad in general, not from your described symptoms. It may be possible considering the state of the other motherboard, though, or if you have had the CPU powered on without the heatsink on it good. I haven't, but maybe the previous "owner" has had the CPU powered on without h/sink & fan. Possible... When I come across a system dead from mysterious causes, it's usually easiest to have an entire 2nd system so each part can be swapped between the two. That is, unless it's something obvious. I'd first suspect an inadequate power supply, and suggest taking voltage readings with a multimeter and/or swapping in another known good/adequate PSU. Unless the fact that AMD processors require a significant amount of power (they operate on 3.3v if I'm not mistaken), then the PSU is good. Well yes they do require a significant amount, as do Intels. The motherboard uses a step-down switching voltage regulator powered by 5V from the PSU, on every KM400 board I've seen and most likely yours as well. It has hauled my own P4 with many devices/peripherals for about a year. By that I mean one ATi Radeon 9800 agp card, two additional pci network cards, pci modem, pci IDE card and 5 IDE devices. When I added the video capture card I decided not to tempt failure and upgraded to a same-brand 350W PSU. Another thought is that this PSU was a bit marginal originally and has been stressed by running the described parts, was about ready to fail either way. It is not necessary the case but yet another reason I would take voltage readings and try a higher capacity name-brand PSU. I have no cards or anything else - it's using (or attempting to) the onboard vga and the 512 RAM is a single unit. In the meantime I disconnected the keyboard, HDD and mouse as well - no go. I also tried with a low-end pci vga card. Have you tried moving the memory to another slot, or using different memory? Since it seems your PSU may be marginal, I suggest leaving the board set to the slowest FSB setting until it works at that speed, THEN trying it higher. Also substitute a less-power-hungry video card if the present one is power hungry... any old PCI or low-end AGP card should suffice. Also try clearing CMOS (or pull battery for 10 minutes) while AC power is disconnected, and check the battery voltage. I've tried that and now I think I'll resort to ripping my sister's AMD processor out of her machine just to get some sort of clarity on the issue. It might just turn out that I now have two perfectly good AMD socketA boards and no processors. Perhaps, or it could be some bios quirk where IF you got it running with a different CPU, updating the bios could possibly help with the other CPU or memory compatibility. I would tend to suspect even this new motherboard as much as the CPU though, unless the prior owner had indeed done something reckless with it. |
#5
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"kony" wrote in message ... On Sat, 17 Sep 2005 16:27:53 +0200, "jona" wrote: That answers my CPU fan doubt, thanks. I figured that perhaps the board detected a too low rpm and thus shut off. It's possible still, though it should POST immedately when you turn it on and then seconds later shut off. It can't do that at first as the fans can't be presumed to be at max RPM yet by the time the system (would have) already started POSTing and displaying the video card then motherboard bios. [......] I haven't, but maybe the previous "owner" has had the CPU powered on without h/sink & fan. Possible... When I come across a system dead from mysterious causes, it's usually easiest to have an entire 2nd system so each part can be swapped between the two. Yes, that would make my current situation easier. Unfortunately I don't have a second AMD setup and they seem to be scarce around here. [.....] It has hauled my own P4 with many devices/peripherals for about a year. By that I mean one ATi Radeon 9800 agp card, two additional pci network cards, pci modem, pci IDE card and 5 IDE devices. When I added the video capture card I decided not to tempt failure and upgraded to a same-brand 350W PSU. Another thought is that this PSU was a bit marginal originally and has been stressed by running the described parts, was about ready to fail either way. It is not necessary the case but yet another reason I would take voltage readings and try a higher capacity name-brand PSU. Have you tried moving the memory to another slot, or using different memory? Moved to a different slot and I temporarily used the PSU and a RAM chip from my own machine. No go. [.......] I've tried that and now I think I'll resort to ripping my sister's AMD processor out of her machine just to get some sort of clarity on the issue. It might just turn out that I now have two perfectly good AMD socketA boards and no processors. Perhaps, or it could be some bios quirk where IF you got it running with a different CPU, updating the bios could possibly help with the other CPU or memory compatibility. I tried my sister's Athlon-PECM, 807Mhz processor and again, it won't even post. I'm not sure whether it should/would though. I mean, that processor is "ancient" technology and certainly not DDR compatible, but ..... ?? I would tend to suspect even this new motherboard as much as the CPU though, unless the prior owner had indeed done something reckless with it. The only new development is that when testing now, or with any other PSU (i tried two), the machine powers up directly when connecting to the wall socket - whether I have the switch connected to it's pinout or not. Still no post though. I also tried the CPU in question on my sister's board (Asus A7V) where it doesn't work either - but that doesn't surprise me. BUT, under correction, her Athlon should have worked on the new board, right ? Further, the "new" board came all boxed with it's various goodies, including IDE cable, manual, driver CD, etc - but *without* the I/O backplate/panel. That almost suggests that it has before been installed somewhere and returned to the vendor ..... sigh |
#6
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On Mon, 19 Sep 2005 16:27:51 +0200, "jona"
wrote: Perhaps, or it could be some bios quirk where IF you got it running with a different CPU, updating the bios could possibly help with the other CPU or memory compatibility. I tried my sister's Athlon-PECM, 807Mhz processor and again, it won't even post. I'm not sure whether it should/would though. I mean, that processor is "ancient" technology and certainly not DDR compatible, but ..... ?? It should've worked, the memory controller is in the northbridge so the CPU cares not what it is, and the FSB was always DDR on a socket A athlon. It could be necessary to clear CMOS before the old CPU would POST the system, but beyond that it should've worked. The only new development is that when testing now, or with any other PSU (i tried two), the machine powers up directly when connecting to the wall socket - whether I have the switch connected to it's pinout or not. Still no post though. I also tried the CPU in question on my sister's board (Asus A7V) where it doesn't work either - but that doesn't surprise me. BUT, under correction, her Athlon should have worked on the new board, right ? I would've expected it to. If this board is still in a box, I'd try it out of the box on a non-conductive (not anti-static material) surface and without the case wiring connected. Sometimes it's the simple things like a stuck case switch or a case standoff shorting the back of the board that'll be the hardest things to find if you're not looking for them. Further, the "new" board came all boxed with it's various goodies, including IDE cable, manual, driver CD, etc - but *without* the I/O backplate/panel. That almost suggests that it has before been installed somewhere and returned to the vendor ..... If it uses the old standard ATX style of rear port locations, like the following picture, it's fairly common for the panel to not be included on mid to low end boards due to it being expected that any standard case would accomodate it. http://www.uvem.com/images/case_comp...2_rear_big.jpg |
#7
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"kony" wrote in message news On Mon, 19 Sep 2005 16:27:51 +0200, "jona" wrote: Perhaps, or it could be some bios quirk where IF you got it running with a different CPU, updating the bios could possibly help with the other CPU or memory compatibility. I tried my sister's Athlon-PECM, 807Mhz processor and again, it won't even post. I'm not sure whether it should/would though. I mean, that processor is "ancient" technology and certainly not DDR compatible, but ..... ?? It should've worked, the memory controller is in the northbridge so the CPU cares not what it is, and the FSB was always DDR on a socket A athlon. It could be necessary to clear CMOS before the old CPU would POST the system, but beyond that it should've worked. That's what I thought. The only new development is that when testing now, or with any other PSU (i tried two), the machine powers up directly when connecting to the wall socket - whether I have the switch connected to it's pinout or not. Still no post though. I also tried the CPU in question on my sister's board (Asus A7V) where it doesn't work either - but that doesn't surprise me. BUT, under correction, her Athlon should have worked on the new board, right ? I would've expected it to. If this board is still in a box, I'd try it out of the box on a non-conductive (not anti-static material) surface and without the case wiring connected. Sometimes it's the simple things like a stuck case switch or a case standoff shorting the back of the board that'll be the hardest things to find if you're not looking for them. I can always give it one more try just before I repack it in it's box to send back to the supplier. Further, the "new" board came all boxed with it's various goodies, including IDE cable, manual, driver CD, etc - but *without* the I/O backplate/panel. That almost suggests that it has before been installed somewhere and returned to the vendor ..... If it uses the old standard ATX style of rear port locations, like the following picture, it's fairly common for the panel to not be included on mid to low end boards due to it being expected that any standard case would accomodate it. http://www.uvem.com/images/case_comp...2_rear_big.jpg No it doesn't. The audio sockets are vertically aligned (same direction as keyb & mouse sockets). Thanks for your time and suggestions. |
#8
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"kony" wrote in message news On Mon, 19 Sep 2005 16:27:51 +0200, "jona" wrote: Perhaps, or it could be some bios quirk where IF you got it running with a different CPU, updating the bios could possibly help with the other CPU or memory compatibility. I tried my sister's Athlon-PECM, 807Mhz processor and again, it won't even post. I'm not sure whether it should/would though. I mean, that processor is "ancient" technology and certainly not DDR compatible, but ..... ?? It should've worked, the memory controller is in the northbridge so the CPU cares not what it is, and the FSB was always DDR on a socket A athlon. It could be necessary to clear CMOS before the old CPU would POST the system, but beyond that it should've worked. That's what I thought. The only new development is that when testing now, or with any other PSU (i tried two), the machine powers up directly when connecting to the wall socket - whether I have the switch connected to it's pinout or not. Still no post though. I also tried the CPU in question on my sister's board (Asus A7V) where it doesn't work either - but that doesn't surprise me. BUT, under correction, her Athlon should have worked on the new board, right ? I would've expected it to. If this board is still in a box, I'd try it out of the box on a non-conductive (not anti-static material) surface and without the case wiring connected. Sometimes it's the simple things like a stuck case switch or a case standoff shorting the back of the board that'll be the hardest things to find if you're not looking for them. I can always give it one more try just before I repack it in it's box to send back to the supplier. Further, the "new" board came all boxed with it's various goodies, including IDE cable, manual, driver CD, etc - but *without* the I/O backplate/panel. That almost suggests that it has before been installed somewhere and returned to the vendor ..... If it uses the old standard ATX style of rear port locations, like the following picture, it's fairly common for the panel to not be included on mid to low end boards due to it being expected that any standard case would accomodate it. http://www.uvem.com/images/case_comp...2_rear_big.jpg No it doesn't. The audio sockets are vertically aligned (same direction as keyb & mouse sockets). Thanks for your time and suggestions. |
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