I got my EVGA Gtx 680 Superclocked a year ago and it started artifacting. and I flashed the bios to try and fix it and it made it worse. so Ive been trying to flash the original bios back onto it but it doesn't want to work with any of my pc's. it won't boot into windows or turn on at all. I've tryed looking on the internet for help, and i tryed changing bios setings and to no avail. it doesn't work on any of my pc's and the only one it works on doesn't boot into windows, it just stays in the bios or lockes up or gives me a black screen when it does boot into windows. ive tryed different psu's but it won't even power up without the main psu in it. any Ideas?