i have a problem with my pc. it boots fine but i get no video output. when i do get output i just get a weird pix-elated black screen with lines of colour. i have just got 16gb of corsair ram. it has been working fine so i doubt it is the problem. im guessing that my gpu is dead but i need some help. i have taken out and reinserted the cmos battery and the gpu. i have continuously switched ram sticks and now i get a double beep from my mobo. windows loads fine because i can hear the startup sound. all the fans are running fine including the gpu fan. plz guys help im about to spend £140 on a new gpu and i need my pc for my coursework!