Vanessa, when you ask a hardware question, you should always tell us what hardware you are using!
I have had two motherboards do the same thing, an ASUS and an EVGA. Both used the NVIDIA chipset. They would start, usually, if I
turned the power off at the power supply and let them sit for several hours. Sometimes the ASUS would not. I got fed up with the
ASUS and replaced it with the EVGA. The new one will always start after several hours of resting. If you are also using an NVIDIA
chipset, you may share my problem. (I will never buy another motherboard with an NVIDIA chipset.) This work-around is a minor
inconvenience.
Another possibility is that your cpu is overheating. Did you do a good job of placing a thin layer of heat-sink compound on the
cpu? I have built a good many computers over the years, and, still, on the last computer that I built, I did not get the compound
on properly (maybe I am getting too old to build computers?) and it shut down. However, I don't think that it shut down quite so
fast.
You may have a short. The likely culprit is on the bottom of the motherboard. Check the clearances between the mb and the case.
Your brass stand-offs **should** keep it from shorting.
Is your power supply up to the job? Since we know nothing of your hardware, it is difficult to comment.
Try disconnecting all the accessories except memory and video card and see if you can boot to the cmos settings.
Dean Kukral
----- Original Message -----
From: Vanessa H.
To: [log in to unmask]
Sent: Saturday, May 02, 2009 7:32 AM
Subject: [PCBUILD] Newly Rebuilt PC turns off.
Hello all,
I need a little help. I have built 5 PC's in the last 8
years and do minor repairs for friends, so I'm not a complete novice. But
recently my son's PC would not turn on. I decided it must either be the
power supply or the motherboard. The first thing I replaced was the power
supply because it was the least expensive. Well, that did nothing. With
the new power supply in place, the PC was still completely dead. I then
purchased a new motherboard, processor and ram. After getting everything in
place, the PC turns on only briefly. I mean it literally only runs for
about 5 seconds. All the fans come on and it looks like it's about to start
up, but it turns off. I tried unplugging all the wiring and starting from
scratch, but I still only get about 5 seconds before it all goes dead. It
seems as though something is shorting out, but I don't know what? Please
help!
Kind regards,
Vanessa H
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