section of your BIOS for a "standby" option.
Just a side note, the power to the mobo NEVER goes fully off because a 5 volt standby voltage remains applied, however, that is not your problem because the power supply would normally appear to be off and the front panel light would be off.
Tell us the nature of the incomplete shutdown, anything on the monitor screen? If there was then it could be one of the normal Win XP shutdown issues.
The USB ports actually can provide 5 volts to power devices plugged into the USB port. However the current available can be very limited in some systems. Possibly the feed on your mobo to the USB got zapped. Possibly related is the failure to shutdown the power supply, and that could also be a mobo problem. With ATX power supplies the logic circuit on the mobo is what actually turns the main power supply rails [main 5 volts, 3.3.volts, and 12 volts] ON and OFF.
If it twere only the USB power problem, a simple solution would be to buy a Powered USB hub external to the computer. The powered type have an adapter that you plug into the AC power and it will provide the five volts to the devices connected to the hubs output ports. They can provide much more current to devices.
I have a question regarding my PC and some problems that I have been experiencing, which I think are related to my power supply.
First off, my PC will not recognize my iPod Shuffle. When I first purchased the Shuffle, everything worked fine, however one day when I went to plug it into my USB port, nothing happened and the orange light on the iPod flashed. I tried all the USB ports, including the ones on the back of the machine to no avail. This is not a problem on other people's machines, where XP is able to recognize the external device.
Also, whenever I go to shut down my computer, the light on the front of the tower is on and the fan is running. It is like the computer is not even shut down. I have to manually turn off the power strip everytime I want to shut my computer off. Also, "Stand by" is not an option on the XP menu.
I've been told this is a power supply issue. Anyone have any other ideas?