Troubleshooting Guide

A–6 www.hp.com Troubleshooting Guide
POST Error Messages
304-Keyboard or
System Unit Error
Keyboard failure. 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.
404-Parallel Port
Address Conflict
Detected
Both external and
internal ports are
assigned to
parallel port X.
1. Remove any parallel port expansion
cards.
2. Clear CMOS. (See Appendix B,
“Password Security and Resetting
CMOS.”)
3. Reconfigure card resources and/or
run Computer Setup.
410-Audio Interrupt
Conflict
IRQ address conflicts
with another device.
Enter Computer Setup and reset the IRQ in
Advanced > Onboard Devices.
411-Network
Interface Card
Interrupt Conflict
IRQ address conflicts
with another device.
Enter Computer Setup and reset the IRQ in
Advanced > Onboard Devices.
501-Display
Adapter Failure
Graphics display
controller.
1. Reseat the graphics card
(if applicable).
2. Clear CMOS. (See Appendix B,
“Password Security and Resetting
CMOS.”)
3. Verify monitor is attached and turned
on.
4. Replace the graphics card (if
possible).
510-Splash Screen
Image Corrupted
Splash Screen image has
errors.
Install latest version of ROMPaq to restore
image.
511-CPU, CPUA, or
CPUB Fan not
Detected
CPU fan is not connected
or may have
malfunctioned.
1. Reseat CPU fan.
2. Reseat fan cable.
3. Replace CPU fan.
Numeric Codes and Text Messages (Continued)
Code/Message Probable Cause Recommended Action