Compaq Evo D300 Troubleshooting Manual page 56

Post Error Messages
Numeric Codes and Text Messages
Code/Message
303-Keyboard
Controller Error
304-Keyboard or
System Unit Error
401-Parallel
Port 1 Address
Assignment
Conflict
402-Monochrome
Adapter Failure
403-Parallel Port
3 Address
Conflict Detected
404-Parallel Port
Address Conflict
Detected
410-Audio
Interrupt Conflict
411-Network
Interface Card
Interrupt Conflict
*L = Long, S = Short
A–6
Beeps Probable Cause
None I/O board keyboard
controller.
None Keyboard failure.
2S* IRQ address conflicts
with another device.
1L,2S* Monochrome display
controller.
2S* IRQ address conflicts
with another device.
2S* Both external and
internal ports are
assigned to
parallel port X.
2S* IRQ address conflicts
with another device.
2S* IRQ address conflicts
with another device.
Recommended Action
1. Reconnect keyboard with
computer turned off.
2. Replace the system board.
1. Reconnect the keyboard
with computer turned off.
2. Ensure that none of the
keys are depressed.
3. Replace the keyboard.
4. Replace the system board.
Reset the IRQ.
Replace the Monochrome
display controller.
Reset the IRQ.
1. Remove any parallel port
expansion cards.
2. Clear CMOS.
3. Reconfigure card
resources and/or run
Computer Setup.
Reset the IRQ.
Reset the IRQ.
Troubleshooting Guide