My GTX 460 has been failing for about 2 weeks and until yesterday has been displaying white lines even during the BIOS POST. I wasn't willing to try this on my mother's oven, instead I used a heat gun and a laser thermometer to monitor the temperature. I started at the lowest temperature possible and gradually increasing until ~160°C, applying heat mostly on the memory chips and GPU for about 10 min. The problem has vanished completely :D
Even though I didn't quite follow this guide, it gave me useful directions, thanks!
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