Over the past week or two, I've had a few instances of cuts to what might have been a blue screen, if it were completely garbled by my graphics card. Everything came up fine after a reboot, and it hadn't happened for several days after a driver update and a good reseating. Until today, when suddenly my computer won't POST with that graphics card in (smaller backup I had lying around passed fine). Card is less than a year old, maybe even less than six months, no problems with it until recently. Is there any sort of cleaning out or are I can take of it without totally ruining warranty, or am I going to just have to call it dead?