Asus Maximus IV Extreme P67 - No VGA detected

[kifinas]

My pc booted to a black screen, it made a long beep followed by 3 shorter beeps. On my 2nd attempt it booted fine. Played Diablo 3 for 1 hour without issues and then decided to restart, to run memtest86 because I suspected my RAM was to blame. And guess what, the beeps and black screen were back. I tried again, no luck.
I checked the manual to see that these beeps mean no VGA detected. What does that mean? Is my GPU dying? Both lights on GPU are green. Why did I manage to boot and play in the meantime? What should I do next? Thank you in advance for your help.

System specs:
Asus Maximus IV Extreme P67
Intel Core i5-2500K @ 4.4Ghz 1.295V (stable)
Corsair Vengeance 2*4GB (Installed 1 month ago but seemed to be working fine)
Asus GTX 560 DCII Top (factory settings)
Corsair GS800
Corsair H60
Western Digital 1TB

[Arne_Saknussemm]

Check that it is seated properly in the slot and also check any adapters cables etc.

[kifinas]

Reinstalling the gpu fixed it, thaks.

[HiVizMan]

Good to know you are sorted mate, it is not unusual for a card to shift during the normal course of use and is always worth while checking both fitments and power cables every so often.