Kevin Vance - I got a new AT power supply for the old box. Unfortunately, it seems…

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06:36 pm

Thursday, July 19th, 2001
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I got a new AT power supply for the old box. Unfortunately, it seems like my assumption that the power supply is the problem was wrong. Both power supplies failed to start. I'm now thinking that the motherboard or cpu is fried. When I hooked up a runs-no-matter-what 486 power supply to the motherboard, the fan whirred, but there was no beep.

I've got less than a week to make this right. I'll try plugging the CPU into the other socket 7 system I have, but it doesn't support MMX, so I don't really know if that's a valid test.
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[User Picture]From: techpimp
2001-07-19 07:28 pm (UTC)
Is this the box with the sparks/fire/whatever?

Odds are the motherboard has been damaged. In newer systems, w/o a switch on the power supply, the motherboard receives 5 volts on a standby line, and when you press the power switch (which connects to the motherboard, not the power supply, you'll note), the motherboard raises a line on the power supply, turning it on. Your motherboard has been damaged to the point where this no longer functions.

While it may be possible to hack it to start (a jumper from the standby line to the sense line could get it to start, but might damage the motherboard more); In truth the motherboard is probably damaged in other ways as well.
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[User Picture]From: kvance
2001-07-19 07:42 pm (UTC)
Yes, that's what I was afraid of. It's going to be a bitch finding a cheap non-ATX motherboard that can handle a Pentium MMX cpu...
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