Radeon HD 6770 w/1gb Running in Dell Studio XPS 9100 24gb I've been getting various blue screens of death, video going blank, reboots, freezes, etc. Ran Dell diagnostics found all video card tests passed with the exception that it could not run the primary surface scan. I'm thinking based on this and issues I've been having that perhaps the video card itself has an issue. Only happens during first hour computer is on - cold - once it warms up it doesn't seem to happen. Any thoughts or ideas?