Computer POSTs but only stays on for a few seconds then shuts off

Hello,

I feel I should mention that this build previously didn't POST, but I took a look at the processor and saw it had a few bent pins. I tried to straighten them out as best I could, refitted the processor (this took a little bit of persuasion).

Now my computer POSTS, gets past the splash screen then tells me it cant boot into an operating system (which is expected as I don't have one installed, this is a new build) then shuts off. When I restart it, it POSTs and stays on for a shorter time, then I restart it again and it stays on for an even shorter time.

Is this a problem with the processor? Is it a home fix? Do I need a new processor?

Thank you in advance for whatever advise you can offer.

Specs;
AMD FX-8320 Vishera FD8320FRW8KHK
MSI 760GA-P43 (FX)
Samsung DDR3 4GB PC3-10600U 1333MHz x2
NVIDIA GeForce GTX 460 SE
Seagate Desktop HDD ST1000DM003
Corsair CX600M
[No disc drive]

I don't recall ever dealing with bent pins on a cpu but if the mobo completes the POST I think that should indicate the cpu is good. POST checks cpu-memory-gpu-OS, the first being verify CPU registers. If it completes POST and gives you 1 short beep then I would assume the cpu is OK.

What beep code are you getting?

Read this.