Anybody have an idea which of the 2 might be going? I have a late 2006 24" White iMac C2D. The graphic card (Nvidia 7300GT) died probably a year ago under Applecare and they replaced it. Something is dying again, but not sure. The attached pics happen maybe once a day or 5 times a day. It just started about a week ago and I don't have any heavy programs open when it happens. Also, when my card died the first time, all the pics were of the tearing kind people post. These pics are always the same but the overall color varies. Sometimes its red, purple, green, blue or orange. The dark square is the cursor which will still move. Thanks!!