T R O U B L E S H O O T I N G
Power-on self-test (POST)
Whenever the computer is switched on, the POST routine tests
various hardware components, including memory, and compares the
actual configuration of the computer with that recorded in
configuration (CMOS) memory. During this time, BIOS sign-on and
POST messages are displayed.
A configuration discrepancy could arise if you have just installed or
removed a hardware option In this case you may be diverted directly
into the BIOS set-up. If POST detects a hardware fault, one or more
error messages may be displayed. A full list of these is given at the
end of appendix C 'System BIOS and set-up'.
Your first action should be to turn off the computer, wait at least 30
seconds, and then turn it on again to see if the error is transitory or
persistent. Persistent POST errors indicate a fault in the system. The
computer may be able to continue despite the error indication (for
example, if a memory chip fails POST, the computer can sometimes
continue with less memory).
If after checking the BIOS settings you are unable to clear the
hardware problem call your supplier or authorised maintainer.
Failure to boot
The computer attempts to boot from a system diskette or bootable
Failure to boot correctly may result in an error message from the
operating system, most others will be from the BIOS.
One common boot failure message is:
Non system disk or disk error. Replace and strike any key when ready.
There may be a floppy disk in the drive which is not a bootable
floppy, in which case remove it, or replace it with one that is.
If the message persists there may be a fault with the HDD, in which
case, check the BIOS settings are correct. If they are then the HDD
may need to be reformatted and the system software restored.