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Dead: Motherboard or CPU?
My machine crashed, and now when I press the power button nothing
happens - no BIOS screen, no LEDs, no fans. I tried a new power supply, same result. I tried a different power switch, same result. The motherboard is an ARIMA HDAMB. I noticed that if I plug the 24pin power supply connector into the m/b first, all the fans start running. When I plug the 8pin connector into the m/b, all the fans stop and nothing happens when I press the power button. I saw in the ARIMA manual that the 8pin connector is dedicated for the CPUs. Do you suspect that the m/b has failed or one of the CPUs? Thanks for your input. |
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#3
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Thanks WebWalker. That makes a difference, but it doesn't fix the
problem. Now, when I hit the power button the drive (HDD, DVD-ROM, Floppy) LEDs light up, the fans all kick on, after a second or two the drive LEDs turn off, but nothing else happens. No video (the card is fine, and I tried a PCI card in there too in case the AGP slot was bad), pressing num-lock doesn't turn the num-lock LED on, and the power LED *never* comes on. I should have also mentioned, when I first plug the power supply into the motherboard, I get a quick whiff of an electrical burning smell. It goes away pretty quickly and I don't see any smoke. |
#4
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On Fri, 09 Sep 2005 10:47:10 -0700, donotemailme wrote:
Thanks WebWalker. That makes a difference, but it doesn't fix the problem. Now, when I hit the power button the drive (HDD, DVD-ROM, Floppy) LEDs light up, the fans all kick on, after a second or two the drive LEDs turn off, but nothing else happens. No video (the card is fine, and I tried a PCI card in there too in case the AGP slot was bad), pressing num-lock doesn't turn the num-lock LED on, and the power LED *never* comes on. I should have also mentioned, when I first plug the power supply into the motherboard, I get a quick whiff of an electrical burning smell. It goes away pretty quickly and I don't see any smoke. Sounds like you have a bad cap on the motherboard. |
#5
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Your are doing what bad technicians so often recommend -
shotgunning. Do as engineers have done for generations. Newer unplug or disconnect anything to find the failed item up front. It requires a 3.5 digit multimeter that is so ubiquitous as to be sold even in Home Depot, Lowes, Radio Shack and Sears. In your case, voltage on the purple, green, and gray wires should have special attention before, during, and after the switch is pressed. Previous text that provides the underlying concepts and procedures for verifying the power supply 'system' (yes the system is more than just a power supply) are discussed in: "Computer doesnt start at all" in alt.comp.hardware on 10 Jan 2004 at http://tinyurl.com/2t69q and "I think my power supply is dead" in alt.comp.hardware on 5 Feb 2004 at http://www.tinyurl.com/2musa Now for something that bothers me in you post. Did you make or break any connections when the power cord was plugged into the wall? No just powered off. Computer must be completely disconnected from the wall receptacle so that damage does not get created when disconnecting power supply 24 pin connector from other parts of the power supply 'system'. If you collect the numbers and still don't understand what you have, well, now you have something to post that will attract the more knowledgeable. Currently your post about fans spinning when you first make a connection tells us nothing useful. And you have not provided enough information to even suspect fails capacitors. Get the meter, get the numbers, and identify the failed part up front without even replacing the power switch on a whim. wrote: My machine crashed, and now when I press the power button nothing happens - no BIOS screen, no LEDs, no fans. I tried a new power supply, same result. I tried a different power switch, same result. The motherboard is an ARIMA HDAMB. I noticed that if I plug the 24pin power supply connector into the m/b first, all the fans start running. When I plug the 8pin connector into the m/b, all the fans stop and nothing happens when I press the power button. I saw in the ARIMA manual that the 8pin connector is dedicated for the CPUs. Do you suspect that the m/b has failed or one of the CPUs? Thanks for your input. |
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