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PC worked for a month....


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#1
surfnsound

surfnsound

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After a month or two of frustration I finaly realized that the power supply I had bought was bad, and once I got that taken care of the computer I was building was up and running. I had it going pretty good for about a month or so, and then one day it just shut down completely; I was in the room on the computer, left for 5 minutes, and came back and it was off. When I try turning it back on now, I get lights and fans for about a half a second before it stops. Nothing happens unless I unplug the computer, then plug it back in, then the same thing happens. I've already taken apart the whole system and put it back together, checking for a short between the case and the motherboard, which I've had happen before. I'm pretty sure my processor isn't fried because my case has a feature that it beeps when the internal temperature reaches a certain point.
I suppose it could be the power supply again, but the fact that I get any fans at all makes me wonder. Basically I'm just out of ideas as to what to try next, and I was wondering if anyone had any thoughts.
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#2
Doby

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Hi,

It does sound like the psu, when you unplug it it resets and then you get that 1/2 second power on and it trips again. Remove the psu from the computer plug into the wall outlet then short the green and any black wirer with a paper clip on the 20 pin connecter that goes to the mobo. This should turn the psu on if not then its bad.

If it does turn on use a digital volt meter and check the yellow and any black wirer it should read 12v but could be plus or minus 5% and still be within spec.

Then check the red it should be 5v + or - 5%

Then check orange it should be 3.3 + or - 5%

If any of these voltages are not to spec replace the psu.

Rick
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#3
Doby

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One other thought check the clear cmos jumper if it is loose or has somehow fallen off the computer will behave like that.

If you have another jumper replace it I had one go bad or was loose or something inside and the computer did the same thing till I replaced it.

Rick
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