Compaq AP200 - Professional - 128 MB RAM Reference Manual page 143

Power-On Self-Test Messages
Message
301-Keyboard Error None
303-Keyboard None
Controller Error
304-Keyboard or None
System Unit Error
402-Monochrome 1L, 2S
Adapter Failure
404-Parallel Port 2S
Address Conflict
Detected
501-Display Adapter 1L, 2S
Failure
* L = Long, S = Short
Continued
Beeps* Probable Cause
Keyboard failure.
I/O board keyboard controller.
Keyboard failure.
Monochrome display controller. Replace the monochrome
Both external and internal ports
are assigned to parallel port X.
Video display controller.
Recommended Action
Reconnect keyboard with
computer turned off.
1. Replace the
keyboard.
2. Replace the system
board.
1. Reconnect the
keyboard with
computer turned
off.
2. Replace the
keyboard.
3. Replace the system
board.
display controller.
Run Computer Setup or
Windows NT utilities.
Replace the graphics
board.
Compaq Professional Workstation AP200 Reference Guide
E-5
Continued