HP EliteOne 800 G1 Maintenance & Service Manual page 198

Control panel message
Network Server Mode Active and No
Keyboard Attached
Parity Check 2
188 Chapter 10 POST error messages
Description
Keyboard failure while Network Server
Mode enabled.
Parity RAM failure.
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.
Run Computer Setup and Diagnostic utilities.