Ok this is one of the WEIRDEST things i have ever experienced at the desktop level.
I'm on my home machine a few minutes ago, just plugging along. and suddenly i get a "Please stand by" Like the computer is going into sleep mode. Then it shuts off. Now I can't turn it back on. I reseated power connections, flipped the rear switch back and forth. When I open the box there is a Green LED lit on the motherboard indicating power. But the computer simply won't turn on. I don't have a power tester anymore. Don't really want to start test swapping power supplies. To me it doesn't seem like a power supply problem! with the LED lit on the motherboard..
The machine simply will not power back up.