Thanks for replying.
I use the rear switch whenever I'm swapping out hardware which is not plug-and-play. (Cards, IDE drives, etc.) The system by and large does power down fine. I don't recall whether or not the keyboard lights flash or not. I have a motherboard diagnostic module that plugs into a PCI slot, and according to the code it gives me, it's POSTing just fine. Here are my system specs:
AMP Athlon XP 1700+
Abit KR7A-133R motherboard
512 MB DDR SDRAM
Chaintech GeForce4 Ti4200 128 MB AGP 8X (running at 4X due to limitations of my motherboard)
Creative Labs Soundblaster Audigy
Keyboard, mouse, etc. The power supply is a "Power Man" FSP300-60GT which seems to be made by at least Aopen, maybe other companies as well. It tests fine with the power supply tester I have, but I don't know of any way to stress-test it, or test it under a load. I hope I'm not leaving anything out.