Troubleshooting...

[J187]

My relatively new build has begun shutting down. It started out just shutting off after a while of use, Blue screen of death style. Now, if I turn it on it boots up and then shuts off and turns back on again. Here is what I've tried to remedy so far.

Reformatted/installed different OS
Running a table fan aimed into the open case for added cooling

Swapped out:

Power supply
Heatsink/Fan with more powerful
Memory
Video card
HDD

So I now have two suspects; CPU and MOBO

Of course, these are the two things I do not have spares of. What can I do to test these two short of swapping them out?

System:

GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX Intel Motherboard

Intel Core 2 Duo E8400 Wolfdale 3.0GHz LGA 775 65W Dual-Core Processor BX80570E8400

CORSAIR CMPSU-450VX 450W ATX12V V2.2 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply

Western Digital Caviar Black WD5001AALS 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

Western Digital Caviar Blue WD3200AAKS 320GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

GIGABYTE GV-R435OC-512I Radeon HD 4350 512MB 64-bit GDDR2 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Low Profile Ready ...

1 x G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory Model F2-8500CL5D-4GBPK

 

[MMM]

It could be compatibility issue with the cpu and motherboard or any other hardware such as memory or could be the power supplies not up to the power needs.
I would look at the PSU or memory.

This is one of the biggest problems doing home builds; compatible issues.
A lesson I learned years ago when building home computers is to stick to one supplier and ask for what is recommended to suit each other component.