HP Pro 3500 Maintenance And Service Manual page 167

"No Connection, Check Signal Cable" displays on screen.
Cause
Monitor video cable is disconnected.
"Out of Range" displays on screen.
Cause
Video resolution and refresh rate are set higher than what
the monitor supports.
Vibrating or rattling noise coming from inside a CRT monitor when powered on.
Cause
Monitor degaussing coil has been activated.
Clicking noise coming from inside a CRT monitor.
Cause
Electronic relays have been activated inside the monitor.
High pitched noise coming from inside a flat panel monitor.
Cause
Brightness and/or contrast settings are too high.
Solution
Connect the video cable between the monitor and computer.
CAUTION: Ensure that the computer power is off while
connecting the video cable.
Solution
Restart the computer and enter Safe Mode. Change the
settings to a supported setting then restart the computer so
that the new settings take effect.
Solution
None. It is normal for the degaussing coil to be activated
when the monitor is powered on.
Solution
None. It is normal for some monitors to make a clicking noise
when turned on and off, when going in and out of standby
mode, and when changing resolutions.
Solution
Lower brightness and/or contrast settings.
Solving Display Problems 157