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I've been using an Ati HD4670 graphic card mounted on an Asus M2NPV-VM mobo for months. One month ago PC started switching off about 1 minute after booting. So I removed the graphic card and reactivated the onboard integrated graphics: PC worked like a charm. Recently I tried another graphic card (Ati HD4350) on the same PC, but mobo didn't recognize it either (BIOS is set to give priority on PCI-E card... so it should work...)

Any suggestion? Is it possible the PCI-E slot has broken, but all the rest is still working? Thx

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Try it in another PCI-e slot if you have one - it is indeed possible that the slot is defective.

EDIT: It's also possible that the PCI-e power connector (I haven't used either of these cards but I believe they require the power connector) isn't providing proper voltage.

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Thanks Shinrai, but: I don't have another PCI-E slot on my board and both PCI-E cards don't have a power connector – Hemme Aug 7 '10 at 6:26
    
I'm sorry to hear that. Barring another machine that you can test it with there's really no way to be sure... – Shinrai Aug 9 '10 at 15:47

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