HP Pro 3420 Maintenance & Service Manual page 124

Table B-1 Numeric Codes and Text Messages (continued)
Control panel message
304-Keyboard or System Unit Error
510-Flash Screen Image Corrupted
511-CPU Fan not Detected
512-Rear Chassis Fan not Detected
513-Front Chassis fan not detected
912-Computer Cover Has Been Removed
Since Last System Startup
917-Front Audio Not Connected
921-Device in PCI Express slot failed to
initialize
1720-SMART Hard Drive Detects Imminent
Failure
1801-Microcode Patch Error
1802-Processor Not Supported
116 Appendix B POST Error Messages
Description
Keyboard failure.
Flash Screen image has errors.
CPU fan is not connected or may have
malfunctioned.
Rear chassis fan is not connected or may
have malfunctioned.
Front chassis fan is not connected or may
have malfunctioned.
Computer cover was removed since last
system startup.
Front audio harness has been detached or
unseated from motherboard.
There is an incompatibility/problem with this
device and the system or PCI Express Link
could not be retrained to an x1.
Hard drive is about to fail. (Some hard
drives have a hard drive firmware patch that
will fix an erroneous error message.)
Processor is not supported by ROM BIOS.
Recently installed processor is not
supported by the system.
Recommended action
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.
Reflash the system ROM with the latest
BIOS image.
1. Reseat CPU fan.
2. Reseat fan cable.
3. Replace CPU fan.
1. Reseat rear chassis fan.
2. Reseat fan cable.
3. Replace rear chassis fan.
1. Reseat front chassis fan.
2. Reseat fan cable.
3. Replace front chassis fan.
No action required.
Reconnect or replace front audio harness.
Try rebooting the system. If the error
reoccurs, the device may not work with this
system
1. Determine if hard drive is giving correct
error message. Enter Computer Setup
and run the Drive Protection System
test under Storage > DPS Self-test.
2. Apply hard drive firmware patch
if applicable. (Available at
http://www.hp.com/support.)
3. Back up contents and replace hard
drive.
1. Upgrade BIOS to proper version.
2. Change the processor.
Install a processor supported by your
system.