Thin vertical green lines on 30" Apple Display

I am occasionally getting patches of short vertical green lines on my 30" display
using Nvidia GF8800GT 512MB
If I put system to sleep when it awakes it's ok
is this indicative of pending failure
this is the second graphics card in my new two month old Mac Pro, original card just stopped working.

Not yet resolved it is erratic when it occurs but lasts for the session and is apparent in any graphics irrespective of application. I had a feeling it was a graphics card problem but may be wrong. I will have to try a stress test when I get chance.

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