HP P920 User Manual page 29

Before calling Hewlett-Packard check the following items:
No picture and LED is off.
Check if monitor is switched ON.
Check if power cord is properly connected.
Check if electrical outlet is connected.
Test if monitor works on another PC previously set to monitor's
supported resolution.
No picture and LED is on.
Check if monitor is not in power saving mode.
Adjust contrast and brightness through Menu using the control
buttons.
Check if PC is switched on.
Check if video cable has no bent pins.
Test if monitor works on another PC previously set to monitor's
supported resolution.
Colors are not pure.
Degauss your monitor.
Shut down your monitor and switch it on after 30 minutes.
Picture is not centered.
Adjust picture through Menu using the control buttons.
Picture is fuzzy.
Use the Recall function.
Reduce contrast through Menu using the control buttons.
Adjust moire reduction to zero.
HP 19" Color Monitor User's Guide
Troubleshooting
English 27