Windows server 2003 Web Edition keyboard not recognized

I am running Windows Server 2003 Web Edition on a dell SC1425. A few hours ago the connection was lost for no apparent reason.

After trying to reboot the problem still isn’t fixed. When I reboot I can work with my keyboard (getting in to bios, etc). As soon as Windows Server 2003 starts to boot, I lose the keyboard. I have had no control over the mouse either.

They are both in a USB port, but I have tried PS/2 ports as well, with no result. If someone could help me it would be greatly appreciated!