I

"I wonder which is the culprit... the monitor or the graphics card?"That would be a graphics card issue. More info about your video card (especially if you are overclocking it) would be helpful.Greg

Thank you for your help.You are right... it isn

The artifacting in your pic is often the result of overheating. You should remove the left side cover of the computer to make sure the VC card fan is still turning. Also, try sticking a small house fan into the open left side to see if that helps.Artic Cooling makes an aftermarket GPU cooler that works quite nicely on your card. They are priced very well, too.You also might try rolling back to a previous driver version (one that offered no problems on your system), but don't get your hopes up. This looks to be hardware related.Good luck,Greg

Thank you for your help once again Greg.I