NT4 Server crash after nightly reboot

[JH24]

NT4 terminal servers restarting over night using "at" to schedule a dos "shutdown /reboot /v" command. Seemingly with no reason, they don't come back up some mornings - but just display a black screen with a single, flashing white cursor. Don't even get to the NT loader screens and the server then needs a total rebuild.

Any ideas what might be causing this?

Thanks very much

 

[Spirit]

Have you tried detaching everything but what is absolutely essential?

Get rid of CD's, BU devices, floppys, sound insight boards the lot! then try adding each one.

Can you give some more details? OS / network conifg / apps

 

[JH24]

Don't think removing CD's etc will help as the problem is so random. (There's no BU devices or sound cards on them).
We're running NT4 terminal server with sp6, citrix XP with SP1, MSoffice 2000.