Thanks for the replies - trying to not turn this into a tech support thread but basically everything was fine for months and last week I started to randomly crash when running 3d programs. Then yesterday I open up SWTOR and it just goes to black screen, since then I was getting no signal sent to the monitor.
Switched it to the 4870 and it was fine... I mean, is there really any option but to replace it? Even if it works on another PC it's not like I can make it work on mine :S
Yes, it's an EVGA card but unfortunately I think I bought this in-store and there's no record on my account. Frustrating as I almost always buy online... maybe I can find a bank statement showing a purchase of the same value.