Computer Shutting Down After Minutes

What are your temps like, GPU, CPU, system?
What are the specs of your system, please be specific?
Have you run memtest86+?
Have you run any HDD diagnostic tests?
 
100°F = ~38°C, so you're CPU temp is fine. It's a bit high for idle, but still fine. Max temp of the CPU is around 85°C. As long as load temps are under 60°C, you'll be fine.

I wonder if your chipset is getting too hot. If it can't say on while in the BIOS for a while, something is crapping out.

Do you have another PSU you can try?

Can you touch the heatsink of the northbridge? if its too hot to keep your finger on it, then thats probably your problem.
 
Which 500W PSU do you have? As BBQ says, not all 500W PSUs are made equal. :p
 
I believe it is a:

COOLER MASTER eXtreme Power RP-550-PCAR ATX from factor 12V V2.01 550W Power Supply 110-115V/ 220-230V Nemko, TUV, cUL, CE, BSM, FCC, CCC

Thats actually a VERY GOOD SevenTeam 450W PSU. :p Try another PSU if you can find one.
 
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