Hello, For the past 3 or 4 days I've been having troubles with fixing a friends HP a1600n computer. Originally, the problem was that ONLY when he was playing a video game for anywhere from 5mins to 2 hrs of play time, it would crash, restart then have a very hard time rebooting, w/o anything coming onto the screen. So we reformatted, updated everything, and gave it some cleaning and Tender Loving Care. It worked fine for about a day. Ran the game for 8 hrs with no problems and no crashing. Then randomly last night, it turned off by itself, and turned on again by itself but no visuals and no boot-up. It's a stock manufactured PC. Also, We applied some Arctic Silver compound yesterday after cleaning the CPU heatsink and used a little too much which ended up fusing the processor to the heatsink. Upon trying to remove them from eachother the processor got ripped out of the port, with the port lock closed and pins got bent, so we replaced the processor with an exact replica and reseated it. Now all the computer does is turn on, with all fans, lights, and as far as I se components working fine, but no visuals come onto the screen, not BIOS, not anything. If anyone could help me figure this out I would appreciate it.