2 nights ago, computer shut down, wouldn't restart. Immediately I thought PSU, since I was getting random restarts the last few days and random shutoffs. So went out and got a new one (500 watt) Then once it was installed, I hit the power button, and all the fans/drives etc, come on and sound perfectly normal. However, it will not post, or do anything else. So, since putting in the new PSU, I have; 1. Removed all memory and replaced it with memory I tested. 2. Tried new HD 3. New IDE cables 4. Returned the PSU, just in case and got a replacement 5. Swapped processors 6. Swapped Video cards 7. Swapped Heatsink 8. Removed CMOS battery/flashed BIOS 9. Changed processor jumpers to SAFE I also have an extra motherboard, which is the same as mine, and the SAME thing happens regardless of what I have hooked up into it. D-Bracket codes- Top 2 Red, Top 2 Green - IDE Controller Initializing Internally, everything sounds completely normal. I tested my old parts, they all work in my wifes computer. So it's a weird problem. K7N2 Delta Kingston 1 gig PC-3200 (x3) Nvidia 6600 Barton 2700+ Athlon XP 476 Peak Load PSU 80 Gig WD HD I really can't think of ANYTHING else, I do know computers, researched on MSI and anywhere else, and still nothing... So summary: Hit Power button, Fans/HD etc. all start up like normal, nothing on monitor/no post.