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Control panel message Description Recommended action
301-Keyboard Error Keyboard failure. 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.
303-Keyboard Controller Error I/O board keyboard controller. 1. Reconnect keyboard with computer
turned off.
2. Replace the system board.
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.
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 on page 233.)
3. Verify monitor is attached and turned
on.
4. Replace the graphics card (if possible).
510-Flash Screen Image Corrupted Flash Screen image has errors. Reflash the system ROM with the latest BIOS
image.
511-CPU Fan not detected CPU fan is not connected or may have
malfunctioned.
1. Reseat CPU fan.
2. Reseat fan cable.
3. Replace CPU fan.
512-Rear Chassis Fan not detected Rear chassis fan is not connected or may
have malfunctioned.
1. Reseat rear chassis fan.
2. Reseat fan cable.
3. Replace rear chassis fan.
513-Front Chassis Fan not detected Front chassis fan is not connected or may
have malfunctioned.
1. Reseat front chassis fan.
2. Reseat fan cable.
3. Replace front chassis fan.
515-Power Supply Fan not detected Power supply fan is not connected or may
have malfunctioned.
1. Reseat power supply fan.
2. Reseat fan cable.
3. Replace power supply fan.
Table C-1 Numeric Codes and Text Messages (continued)
188 Appendix C POST Error Messages