Okay, did that. Still the same, no display when VC is inserted.
What I also did is I entered safe mode and cleaned my GPU driver. Now it boots to windows WITHOUT the VC, but still no display when VC is used. Everything seems good without the VC. Does this mean there is a problem with it?
650w of PSU is already more than enough I believe for a single 6850. Anyway, I would go over to a friends house to check the parts I have on his computer. Thanks for the help anonymous1 and to all those who replied! Cheers!