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I had recently upgraded my D630 from Intel to Nvidia and believed it would last a long time with the copper shims I installed that appeared to be keeping temperatures around 72 degrees at the highest load. To my surprise, however, The graphics chip seems to have failed suddenly. I did not experience the gradual artifacts as others have; just two OS hangs/freezes and then a blank screen. There is no video on the external port either (fn CRT) even at boot although my monitor detects a non-supported format. The Last thing I was doing was watching Netflix. I had just turned off HD because my system appeared to be outmatched and was also testing the "Media Hint" Firefox add-on. I initially suspected that this add-on was the culprit because I have not experienced any video issues before aside from slow playback/tearing with HD video. Is it possible that MY BIOS Was corrupted or is the chip surely dead? I can go back to my Intel motherboard but am hoping this problem is fixable. Thanks for any help.