Windows Server 2008 Keyb/Mouse non-responsive at Login Screen?

I have a new install of Windows Server 2008 on a RAID machine under 1 year old (machine previously had Ubuntu on it). Windows server installed fine, created admin account etc. After the install when rebooting I'm getting an odd problem.

The keyboard and mouse are non-responsive on the login screen (CTRL+ALT+DELETE to login).

The keyboard and mouse both 'light up', the keyboard works at a BIOS level. Both devices work in other machines too. Its only once Windows loads to they become non-responsive.

I have the same problem when using different keyboard/mouse combinations on this machine. fine at BIOS level, fail at Windows login screen.

Tried booting in safe mode - same problem. tried powering down, leaving for a bit, rebooting again - same problem.

Have tried various keyboards and mice in various USB ports - same problem.

Has anyone else come across this? It has me completely stumped.

Connect to the server remotely (RDP) and validate that it has drivers for your particular USB controller or hub. From what you said it sounds like USB isn't working at all. If PS/2 is available you should try that as well.

Just connect a PS2 mouse and keyboard to access console. Check later if USB drivers are correctly installed on Windows Device Manager page.