Hey Invalid Opcode,
I've got the same motherboard and when it runs, it runs great. But it does experience intermittent problems when powering up after the system is shutdown. Many others have reported similar problems.
Yor best bet would be to test each component seperately if possible. Say, if you could try out the graphics card on a friends X58 mobo? It it works on his, then you likely have a mobo issue. Or try installing a different graphics card on your mobo and see what happens.
Also, the link below is a great place for Gigabyte motherboard technical support. Good luck!
I hang out there a lot waiting for another BIOS update to be released