Ok, I built my rig a year ago in late May. I upgraded from my stock 500W PSU to an ABS 800W PSU over winter, and added 2 GB RAM to give me 4GB. My specs are an E6600 C@D(2.4GHZ), 4GB PC2-6400 RAM, ONE EVGA 8800GTX, Western Digital HDD, LITE-ON DVD Burner, and an XFX 680i LT SLI motherboard. Well the night I built my pc last year it wouldn't start or give me video. It eventually worked after a few hours but I don't know what I did to fix it, I think the problem came from only having a 4 pin connector for the CPU and not 8 pin. Well my 800W has the 8 pin, and everything has been working great since the day I built my pc and even when I upgraded my PSU and RAM. Well all of a sudden yesterday I got this problem again. When I turn on my computer everything turns on, and I mean everything. My GTX's fan is spinning, the CPU heatsink fan is spinning, my case LEDs are on, case fans are on, my wireless card's light is on, and my motherboard's green, yellow, and blue lights are on. My DVD drive can open. But I don't get any video signal and I can tell it never goes into Windows if I let it sit for a few minutes because my mouse's LED's don't light up as they normally would. I swapped my RAM around and took out the CMOS battery for 6 minutes and neither of which helped. I unplugged my 8pin CPU wire, 24 pin motherboard wire, dual 6 pins for my video card, and none of this helped after plugging them all back in. I have Googled the problem and have seen threads of people who have gotten the same problem but for various reasons but none had answers. What do you guys think the problem is and how to fix it? I wasn't OCing my CPU but was OCing my GTX a little bit but that hadn't been changed in a while and was stable. I hadn't done or changed anything to/in my computer at all if that helps. THANKS!