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Control panel message Description Recommended action
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.
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.
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.
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, 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.
512-Chassis, Rear Chassis, or Front Chassis
Fan not Detected
Chassis, rear chassis, or front chassis fan is
not connected or may have malfunctioned.
1. Reseat chassis, rear chassis, or front
chassis fan.
2. Reseat fan cable.
3. Replace chassis, rear chassis, or front
chassis fan.
514-CPU or Chassis Fan not Detected CPU or chassis fan is not connected or may
have malfunctioned.
1. Reseat CPU or chassis fan.
2. Reseat fan cable.
3. Replace CPU or chassis fan.
601-Diskette Controller Error Diskette controller circuitry or floppy drive
circuitry incorrect.
1. Run Computer Setup.
2. Check and/or replace cables.
3. Clear CMOS.
Table C-1 Numeric Codes and Text Messages (continued)
208 Appendix C POST Error Messages