Computer not staying on 1

[hobbytech]

I'm having problems with my custom built system. It is made up of a ASRock 4CoreDual-VSTa motherboard, Intel Pentium D CPU 2.80 GHz, WDC-WD10EZEX 1TB HD, WDC WD500GB HD, 250 GB SSD, NVDIA GeForce 8400GS video board, Vista-View Saber DA-1N1-PCI TV Tuner running Windows XP SP3. It started shutting off for no reason and sometimes not powering back up so I changed from a 600 watts power supply to a 800 watts power supply. I have 4 case fans plus the power supply fan and the cpu fan in it. The few times that it does stay powered up I have to select Windows debugging mode to get it to stay on (about 4 hours). When it is running I have run Ad-Aware Antivirus, Systems mechanics, Malwarebytes and CCleaner, but the problem remains. Anyone has any suggestions? I like this motherboard because it can run both IDE and SATA devices.

 

[hobbytech]

I change out both my CPU and heatsink/fan. Installed Intel Core 2 Quad Q6600 CPU, a Cooler Master Hyper D92 CPU Air Cooler and added 2M of memory. The thermal paste on the Pentium D that I took out was dust. Ran Intel Processor Diagnostic Tool and it showed a "check fan and heat sink warning" but it passed all the stress test including the temperature test. Been running 24/7 for about two weeks now. Look like problem is solved. Great advise from everyone, even learned some new things about using the software (Windows Event Viewer). Thank You Everyone.

 

[goombawaho]

I'm wondering why you would b getting a warning NOW from the diagnostic tool. Shouldn't this be a concern?

"Living tomorrow is everyone's sorrow.
Modern man's daydreams have turned into nightmares.

 

[apstef]

Just one question: Why did you buy a decade-old CPU?

 

[goombawaho]

Motherboard support, that's why.
LGA 775 for Intel® Core™ 2 Quad / Core™ 2 Extreme / Core™ 2 Duo / Pentium® XE / Pentium® D / Pentium® 4 / Celeron® D, supporting Quad Core Kentsfield processors

"Living tomorrow is everyone's sorrow.
Modern man's daydreams have turned into nightmares.