HP Compaq SP700 Reference Manual page 126

11-2 Troubleshooting
Be sure all the needed device drivers have been installed. (For example,
if you are using a mouse, you need a mouse device driver.)
Ensure that all printer drivers have been installed for each application.
Take out all diskettes from the diskette drives and all CDs from the
CD-ROM drive or DVD-ROM drive before you turn off your system.
If you have corrupted your Windows NT Workstation configuration,
reboot the workstation. When the startup program prompts you to press
the spacebar to invoke the last known good menu, press the spacebar.
Windows NT Workstation remembers your last working configuration
and runs it.