I had similar problems. I traced the problem to loading over loading the USB system and mixing USB 1 and USB devices. Trail and error plug in fixed my system. My system maxed out when I had more than 3 USBs plugged into my 6 port computer. Bob G
Boy, I am having troubles with USB.. I have a compaq presario s5000v with usb 1.1 and about 2 or 3 days ago, my usb ports started acting very strangely... Devices that were previously connected work fine, my mouse and my usb headset are fine and work as long as they are plugged back into the original ports they were plugged into... But for some reason when I plug new things in, they are not detected, I've even added a usb 2.0 pci card today, that card won't detect anything either... HeLP!