Yeah it is just Cs:go mainly. The only other odd thing is I don't see the windows logo on start up but I do with the onboard graphics. I have undercooked the card back to standard 7970 speeds as mine is a factory of version.
Usually a black screen where you can still hear audio is a hardware/driver issue.
Resolved Issues
A black screen/TDR error may be encountered when booting a system with Intel + AMD graphics and an HDMI monitor connected