Problems when starting
Whenever the computer is turned on or reset, the power-
on self-test (POST) routine tests various hardware
components, including memory, and compares the actual
configuration of the machine with that recorded in
configuration (CMOS) memory.
A configuration discrepancy could arise if you have just
installed or removed a hardware option (for example, if you
have added or replaced SIMMs). In this case you are
prompted to invoke the SETUP utility.
If POST detects a hardware fault, one or more error
messages are displayed. You may also be prompted to "Press
the F1 key to continue".
Your first action should be to turn the computer off, wait
at least 30 seconds, then turn it on again to see if the error
condition is transient or persistent. Persistent POST error
messages may indicate a fault in your system. If you press
F1, the computer attempts to boot despite the error
indication (for example, if a memory chip fails POST, the
computer can continue with less memory). If the problem
persists, make a note of the error messages and the
conditions under which they occur, and consult your
supplier or an approved maintainer.
The computer uses special audio beep codes to signal
certain hardware faults. If you hear a beep code which is not
accompanied by a POST error message (see above), call your
supplier or an authorized maintainer.
7/2 XEN OWNER'S HANDBOOK