Graphics card or monitor fault?

[The Darkness]

Hi

I was wondering if theres an easy way to tell if a fault (a vertical band running top to bottom of screen; sometimes there, sometimes not, slightly different colour) is due to a faulty graphics card, or a monitor (or even a driver?). If I take a screenshot the fault doesnt show up in the screenshot - does that narrow it down? I'm running 84.21 drivers on a 7900GT.

Apologies for the basic questions and any help greatly appreciated,

Cheers

 

[The Darkness]

Thanks for the replies - sounds like its a monitor issue then as when I capture screen shots the line is not captured in them. I'll post on them monitor board for more help - cheers.