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dead motherboard quandry (2xPSU, 2xMB, 2Xvideo cards = zero POST)
Hello all. I've spent the last few hours reading posts here and on the
web, and will be picking up a multimeter tomorrow. However, in the meantime, perhaps you can give some suggestions. I started out with a working MB w/ 400W psu. Then I decided to add a raid system to it, so purchased many drives + 500W psu of some well-liked brand ( *goes over to look* Coolmax silent switching) Overkill, likely, as the total draw of the four additional drives is 40W, but I wanted a comfortable margin. lot of good that did me... Long story short, I put all the drives in, wired them up to the new psu, and... nothing happened. Not even a POST. No beep. Video fails to turn on. I tried again, and manged to get a post maybe 1 time in 7. Unplugged the new drives (so back to the config that worked w/ the 400W psu), and not POST at all. Tried with the old psu: still no joy. Tried without any peripherals at all, except video: no joy. Video, eh? I swapped in a known good video card, and lo! we're POSTING again. once. then never again. Today I bought a new MB, and tried that instead, with both the old and new psu, and the old and new video cards. still no joy. So to summarize: 1 psu that used to work, 1 that is overspecced and brand new 1 video card that used to work (but I notice the cooling fan is HARD to turn by hand now), 1 video card that was known good previously. (both ATI Radeons w/ DVI output) 1 mb that used to work, 1 brand new with ram installed and without (only have a single stick) Same processor (1.4ghz celeron, intel std heatsink) NO combinations thereof will even give me a power-on beep. What I see: CPU, PSU, and case fans all spin up. Video card fan does not... for either vidcard, for either mboard. A sign... of what? that both video cards are busted? that ATI fans only spin when needed? So a few questions: does the keyboard need to be plugged in in order to POST? What about the CPU? Are there any clues (appart from the multimeter I'm buying tomorrow) I can use to figure out which component(s) is busted? Any and all thoughts appreciated, Johan |
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Your reply much appreciated.
Does the video card need to plugged in, in order to POST? the new MB (an intel d865perll) has a built-in speaker: what is the minimal configuration I need in order to verify that the MB+CPU is potentially functioning? is it: outside case, psu plugged in with both cables, and CPU(+fan) attached? No kbd, no drives, no video card, no mem? |
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kony wrote in message . ..
is it: outside case, psu plugged in with both cables, and CPU(+fan) attached? No kbd, no drives, no video card, no mem? That would be a good first attempt. I can't be certain that ALL boards will produce generic long beep without memory, but that is typically what happens. You might consult the board manual to see if Intel has done anything unique with beep codes on that board. However, the question then arises whether we could assume motherboard is then completely viable or only working well enough to make a generic beep, which doesn't require decompressing and running it's bios code (and proper subsystem support for doing so) AFAIK. Well, the multitester claims that both PSUs are putting out the right voltage, however, because I can't do simple math and walk at the same time, I bought the wrong Ohm resistor, so haven't been able to verify that under load. what a pain; I have no idea what to do next, short of buying a new barebones pc and populating it. |
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