Strange lines on my screen - graphics card issue?

Hi!
I'm totally new in this forum but from what I've read you guys really knows a lot about macs.
I have experienced some flickering lines appearing on my screen especially when watching graphic intensive webpages or changing resolution in games or switching to full screen on flash-based video websites. These lines are often accompanied by a low twittering noise from the computer. Sometimes it's just a few lines but sometimes the whole screen is covered. Logging off will fix the problem temporarily.
My theory is that my graphics card is giving up. What do you think? Is there something to do about it other than to change the card?
I have run tech tool 5 without any errors.
I would really appreciate some help. I took a pic of the screen with my iPhone but I suppose I can't upload it here for you to see?

I've seen screens like that due to a seating problem with the card.
As you describe, logging out, or a restart would restore the screen.
When I first saw this behavior, it was when the machine was awakened from Sleep......
Reseat the card, and when tightening the hold down screw, make sure the card does not pull over to one side as the screw is tightened.
The clockwise turn of the screw can move the card over (down in the G5) which can cause some pins to have weak contact.
Also take care that the card is not tilted forward at all.
Pulling on the cables can cause the connectors toward the rear of the card to slightly lift out of the slot.
If, after cleaning, and adjusting the seating of the card, the symptoms continue, or especially if they worsen, the card may be considered compromised.
I would also try running the machine in a new user account just to be sure that a software problem within the account isn't culprit.

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