Dell Dimension E310
Windows XP Pro
4 GHz memory
Intel Duel Core 3.00
500 GB SATA HD

I powered up the computer and got the screen for my name. The mouse arrow appeared but it would not move. The mouse is USB. I turned the computer off and tried different USB ports and four different mouses with the same result. I don't get "new hardware detected" or any other message. Any help would be appreciated.

Thanks.