HP ProOne 400 G1 Maintenance & Service Manual page 175

Table 11-1 Numeric Codes and Text Messages (continued)
Control panel message
Invalid Electronic Serial Number
Network Server Mode Active and No
Keyboard Attached
Parity Check 2
Description
Electronic serial number is missing.
Keyboard failure while Network Server
Mode enabled.
Parity RAM failure.
Recommended action
Enter the correct serial number in Computer
Setup.
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.
Run Computer Setup and Diagnostic utilities.
POST Numeric Codes and Text Messages
165