Compaq Deskpro Workstation AP240 Reference Manual page 198

Power-On Self-Test Messages
Message Beeps*
Green Power LED None
Blinks 1x / Second.
Green Power LED None
On
Invalid Electronic None
Serial Number
Flashing Power and None
Hard Drive Green
LEDs
Red Power LED None
Blinks Every 2 or
more Seconds.
* L = Long, S = Short
E-12 POST Error Codes
Continued
Probable Cause
Computer in normal Suspend
mode.
Computer on.
Electronic serial number has
become corrupted.
Unseated riser board.
Power supply overloaded.
Recommended Action
None
None
Run Workstation Setup. If Setup
already has data in the field or will not
allow the serial number to be entered,
download from www.compaq.com and
run SP5572.EXE (SNZERO.EXE).
1. Remove riser board.
2. Wipe connector.
3. Reinstall (refer to Chapter 5,
"Upgrading the Desktop
Workstation," or Chapter 6,
"Upgrading the Minitower
Workstation," for directions on
removing the riser board).
1. Push in power button. LED should
be green.
2. Remove all AC power from
workstation, wait 30 seconds, then
apply power.
3. Remove load from power supply
by removing options one at a time
until workstation runs.
4. Check for damage to system
board.
5. Replace system board.
6. Replace power supply.
Continued