USB Problems - USB Keyboard Shuts Off

Hi! Here's my problem for the day. My PC uses a USB keyboard. Whenever I plug into another device into another USB port my keyboard shuts off. However, there was one port (out of two in the front) on my PC that I've used that works fine for a CF card reader, but doesn't cooperate with anything else. When I plug in my scanner, though, it too will cause my USB keyboard to shut off. The only way I can regain power to my keyboard is to reboot and not have any other USB devices connected. If I do reboot with any devices connected, my keyboard shuts off during the Windows ME splash screen. The PC I'm using is home-built (by me). It's been exceptional except for this issue. (I did originally have problems installing the drivers the first time, but I thought I was able to resolve it.) Any clues? TIA!

hi Elitana,

there is a website dedicated to nothing but usb problems, complete with forum, ive used it myself. one of my homebuilts would shutdown when i plugged in a usb device. turned out to be a faulty PS.

http://www.usbman.com/