My desktop's screen keeps blacking out for about a second or 2 every now & then. Also it all freezes up occasionally, and now its freezing and then re starting. what the..... it never did this before i removed the cpu fan to clean. i did some research on this forum and thats when i discovered the whole thermal paste issue. So last night I cleaned the surfaces with isopropyl alcohol and then applied the thermal paste. This morning I turned the computer on and straight away the screen blacked out again. Then when I tested my game, the whole system froze, shut down and rebooted. aaaarggh, what can I do now??