PC keeps turning off randomly - not heat related

Hi all
Yesterday while I was using my pc, just surfing when the pc just switched itself off. I tried switching it back on but everything powered up for about 2 sec's then shut off again, it would keep doing this untill I powered it off from the PSU..
I have changed the cpu with a good one, tried changing graphics cards, changed memory, I have also tried the cpu in another 1155 board but the same thing happened there. I then thought that it must be the PSU, so I tried an old AMD board and everything worked fine.
PC SPECS
MSI P67A-GD65 REV3
lATEST bios AS OF Dec 2013
HD 7870
Windows 8.1
2x4GB CORSAIR MEMORY
i5 1155 Socket
OCZ ZT Series 650W PSU
There are no post beeps either.
The thing is I can't get the pc to boot into any screen.
At the minute I'm using an acient amd board and its so slow (glacial slow)
Any suggestions.

As you replaced anything but the board it seems it died. Try clearing cmos and running the board out of case on a non-conductive surface with just basic components.

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