AMD Phenom 9850 Black 4gb PC6400 ddr 800 ATI Visiontek 3870 512mb 500gb western digital HD 700w OCZ Game X StreM PSU Windows Vista Home Premium 64 I started witha a barebones system and built it up from there. I worked perfectly for 3 weeks. I was playing WoW and I kept getting so memory errors and had to restart the game. Other than that the system worked perfectly untill a few days later, it simply wont boot. All of the fans are working except the one on the video card. The optical drive is lite up but it will not open. I dont not get any beeps. Here is what I tried thus far. First I reset the CMOS by jumpers and battery removal. 2. I replaced the motherboard (still did not work) 3. Replaced the old 600w psu with the one mentioned above (still did not work 4. Replaced the video card (still did not work) 5. Replaced the memory (still did not work) I have re- set the cpu with some OCZ thermal paste (still did not work) I have tried to work forwards and backwards from barebones to complete and still nothing. I do not have an onboard video option. I had spent a decent amount of money on this system and just to have it diagnosed will cost $100 so I hope someone can help me out.