HP 1850R - ProLiant - 128 MB RAM Troubleshooting Manual page 206

POST Error Messages
Table C-5: 300 Series POST Error Messages
Error Code
303-keyboard
controller error
304-Keyboard or
System Unit Error
C-26
Audible Probable Source of
Beeps Problem
None System board, keyboard,
or mouse controller
failure occurred.
None Keyboard, keyboard
cable, mouse controller,
or system board failure.
continued
Action
1.
2.
3.
1.
2.
3.
HP Servers Troubleshooting Guide
Be sure that the
keyboard and mouse are
connected.
Run Diagnostics to
determine which is in
error.
Replace the indicated
part.
Be sure that the
keyboard and mouse are
connected.
Run Diagnostics to
determine which is in
error.
Replace the indicated
part.