I have had this problem for awhile now. Before I could just mess with it a little bit and it would randomly turn back on. Well, I had to turn it off 2 days ago and move it somewhere else and of course it wouldn't start. I got the usual blinking amber LED. I heard a solution for some people was that a USB port shorted and it stops it from starting up. I happen to have a broken USB port. The problem is yesterday I was unplugging it and taking cords out of the back, I also took out the Mobo battery thing and put it back in, which is what I had done before. After awhile of this, the LED wouldn't even blink Amber anymore, so I can't check to see if the USB is causing the problem. Is it possible that by unplugging and plugging it back in so many times I really messed up the PSU? However, the Mobo light stays a normal steady green whenever I have the PC plugged in, making me think it isn't the PSU. Sorry for wall of text, any replay would be appreciated, I have read many threads about this problem with many different solutions. It isn't an easy problem to fix.