Hi people, I've build a PC over a year ago, in the last few months it just like to turn itself off, for no reason at all. Someday it will be on for over night, and someday it will only stay on for an hour or two, the quickest was 5 min. Have run virus scan and is the matter of fact, I’ve format the hard drive and reinstall everything, but no use. To restart the PC I need to switch the power off the wall socket for 5 second then switching it on ( because the power button won’t do anything like it’s not been plug in, but the funny thing is that the led light for the LEN is still on). The system will just power itself on even without me pressing the power button on the PC. The only things I have add since I build the system was a 250GB Western D HD, but it was still working fine for around 6 month before the problem start. I’ve try changing the heat sink, a new 450w PSU, but no help. I got a hunch about what go wrong, It sound as it’s accessing one of the hard drive just before it power itself off (I do mean it power itself off like pulling the plug off), so I wonder would it be possible for the HD to get too hot and set the system power off? Please help. And many thinks in advance.

AMD 2600
PC2700 512MB
Asus a7n8x-e motherboard
MX440 Graphic card
Western D IDE 250GB
80GB serial ATA hard drive (two partition, one for OS and the other for APP)
16GB IDE HD

Sorry a couple of things miss, my system also has a DVD writer and a combo drive and as there are not enough power led, I have also use a 1 to 3 power spilter.

Have you tried clearing the CMOS?

Have you checked the Hardware Monitor in the BIOS Setup?

Also check your Event Viewer:

Start/Run/ eventvwr

Open the System tab.

sorry it take so long to reply, have done all of the above but no help, evenviewer did not record anything that is unusual the only thing I've yet try is the stress test on the BIOS

Power splitters can sometimes be real funky

Run with the case open | be grounded | check the connections for HEAT!!!

Also look for any Brown/Burn on the plastic connectors.

Unplug / replug ...