HP EliteDesk 800 G1 Tower Service Manual page 251

Control panel message
301-Keyboard Error
303-Keyboard Controller Error
304-Keyboard or System Unit Error
501-Display Adapter Failure
510-Flash Screen Image Corrupted
511-CPU, CPUA, or CPUB Fan not Detected
512-Chassis, Rear Chassis, or Front Chassis
Fan not Detected
513-Front Chassis fan not detected
Description
Keyboard failure.
I/O board keyboard controller.
Keyboard failure.
Graphics display controller.
Flash Screen image has errors.
CPU fan is not connected or may have
malfunctioned.
Chassis, rear chassis, or front chassis fan is
not connected or may have malfunctioned.
Front chassis fan is not connected or may
have malfunctioned.
Recommended action
1. Reconnect keyboard with computer
turned off.
2. Check connector for bent or missing
pins.
3.
Ensure that none of the keys are
depressed.
4.
Replace keyboard.
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.
1.
Reseat the graphics card (if applicable).
2. Clear CMOS. (See Appendix B,
Password security and resetting CMOS
on page 249.)
3. Verify monitor is attached and turned
on.
4.
Replace the graphics card (if possible).
Reflash the system ROM with the latest BIOS
image.
1. Reseat CPU fan.
2.
Reseat fan cable.
3.
Replace CPU fan.
1. Reseat chassis, rear chassis, or front
chassis fan.
2.
Reseat fan cable.
3.
Replace chassis, rear chassis, or front
chassis fan.
1. Reseat front chassis fan.
2. Reseat fan cable.
3.
Replace front chassis fan.
POST numeric codes and text messages
239