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Table 4-10 POST error messages (continued)
Screen message Probable cause Recommended action
304—Keyboard or System
Unit Error
Keyboard failure. 1. Reconnect the keyboard with the computer
powered off.
2. Connect a keyboard directly to the computer
(instead of through a switch box).
3. Be sure that none of the keys are pressed.
4. Replace keyboard.
5. Replace system board.
510—Splash Screen image
corrupted
Splash Screen image has errors. Update system BIOS/UEFI.
511—CPU Fan not detected Fan is not connected or is defective. 1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
512—Rear chassis fan not
detected
Fan missing, disconnected, or
defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
513—Front Chassis fan not
detected
Front fan missing, disconnected, or
defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
514—Power supply wattage
insufficient for hardware
configuration
Computer configuration requires more
power than the power supply can
provide
Reduce the computer power consumption.
515—Power supply fan not
detected
Power supply fan is disconnected or
defective.
1. Reseat the power supply cables.
2. Replace the power supply.
517—Memory fan not
detected
Memory fan missing, disconnected, or
defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
518—PCI fan not detected PCI fan missing, disconnected, or
defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
519—Hard drive fan not
detected
Hard drive fan missing, disconnected,
or defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
520—Memory fan (2) not
detected
Memory fan (2) missing, disconnected,
or defective.
1. Reseat the fan cable.
2. Reseat the fan.
3. Replace the fan.
Diagnostic codes and errors
155