NCR 7458 - Manual (Page 19)

Chapter 2:
POST Diagnostics
Power-On Self-Test (POST) Errors
Whenever a recoverable error occurs during POST, the BIOS displays
an error message describing the problem.
If a system boot is incomplete (for example, the system is turned off
while it is going through the POST), then the next time the system is
powered on you may get a message stating that the previous boot was
incomplete. The BIOS will revert to safe values for the chip set, caches,
I/O components, etc. This provides the best possibility of returning to
the Setup routine and to normal functioning, but these values do not
always produce maximum system performance. To achieve maximum
performance after the BIOS has reverted to safe values, re-enter Setup
and select the maximum performance values.
If, for example, the terminal was simply turned off during POST, you
can return to the maximum performance values by simply entering
Setup and exiting or by rebooting.
During POST, you are asked to press <F1> and boot with the default
configuration. If you simply presses <F1> and then do not later return
to Setup, the system will boot; but the external cache will not be
enabled, even though the default configuration will enable the cache.