PC powers up for 4 seconds, then shuts down

August 13, 2011 at 11:11:11
Specs: Windows XP SP3, Core2Quad/4gb Corsair DDR2 800
Hi all,

I was using my pc when it suddenly crashed. Upon bootup, the system started powering, maybe for 4 seconds (no picture on screen), and the fan just switched off, and that's what it'it keeps doing over and over again.

I tried removing RAM sticks and VGA because I had spares of those, but today I went and bought a new PSU and as I was at the shop, decided to buy a RAM upgrade. However, it still is doing the same thing with the new components.

I took out the motherboard (placing it on foam etc), and tried it there (thinking it could be a short in the case (saw that happening once).. Also cleaned all dust etc from all vents/fans etc.

So practically, with just bare components (MB/VGA/RAM/PSU) it still keeps doing the same thing over and over.

Practically the only choice would remain to be either the Motherboard/CPU/Thermal fan, but i'd rather see if asny of you can please help me rather than dashing off to a shop and buy more parts !!

The System has the following specifications :

-Asus P5QPL-AM Motherboard
-Intel Core 2 Quad 2.8 Ghz
-Memory (original 2 x 1Gb DDR2 RAM), and now with 2 x 2GB Corsair XMS DDR2 (both sets 800Mhz)
-Nvidia Geforce GTX 470
-PSU original was Silverstone Zeus Model ST85ZF (850Watts) and the new one XFX Core Edition 750 Watts (and yes, both have the 2 x PCI-E neded for the GTX 470)

Thanks in advance, and help would be appreciated !!!!

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August 13, 2011 at 21:40:47
Did anyone remove the CPU heat sink or even loosen it up (maybe while cleaning dust out??? If the heat sink was removed or in any way repositioned, then the thermal compound needs to be completely removed from both the CPU and the heat sink and reapplied properly.

You have to be a little bit crazy to keep you from going insane.

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