Control panel message Description Recommended action
Invalid Electronic Serial Number Electronic serial number is missing. Enter the correct serial number in Computer
Setup.
Memory Parity Error Parity RAM failure.
Third-party graphics card may be causing a
problem.
Run Computer Setup and Diagnostic
utilities.
Remove third-party graphics card to see if
the problem goes away.
Network Server Mode Active and No
Keyboard Attached
Keyboard failure while Network Server
Mode enabled.
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.
Parity Check 2 Parity RAM failure.
Third-party graphics card may be causing a
problem.
Run Computer Setup and Diagnostic
utilities.
Remove third-party graphics card to see if
the problem goes away.
Table C-1 Numeric Codes and Text Messages (continued)
102 Appendix C POST Error Messages