Computer broke down.. Again.

Ok, this time i was just overclocking a little (because of a laggy BC2), and suddenly my graphics card poofed out, and the computer shut itself down. When I press the power button, it goes for 4 secs, and then shuts off. I have tried resetting BIOS by removing the mobo-battery and I have even switched back to my old CPU. But without succsess. I have no qlue what so ever what this might be. Ill be leaving the mobo-battery and the PS out tonight, and I hope it will be back to normal in the morning/afternoon (depends on when I wake up xD). Help much appreciated. I think I must seriously stop overclocking because of my many faults. If anyone have ANY qlue of this, please let me know.

[kingloser]

hopefully u didnt fry ur memory.

Ill try and set in another pair of memory right away and test that. Thanks for the reply.
----------------------------------

I think my mobo is broken... Usually if I have no memory inserted, it makes that beeping noise. It does not matter whenever I have the memory inserted or not. No difference at all. Whatever I do it gets the same result. I think I have to buy a new mobo...

I've had a similar thing happen, turned out to be a heatsink on the cpu wasn't making good contact which made the cpu overheat and shut the system down to protect itself.