Colour monitor 21P4
No display (power indicator does not light)
ÊCheck whether the monitor is switched on.
ÊCheck whether the power cable on the monitor is connected correctly.
ÊCheck whether the computer is switched on.
No display (power indicator lights)
ÊCheck whether the computer is switched on.
ÊCheck whether the data cable for the monitor is correctly attached to the monitor port on the computer.
ÊCheck whether the monitor connection of the computer used is active.
ÊPress any key on the computer keyboard – the computer may be in energy saving mode.
ÊChange the brightness and/or the contrast; the monitor may be adjusted to the maximum dark setting.
Error messages on the screen
Sync. Out of Range
The input signal (horizontal frequency and refresh rate) does not correspond to the technical monitor data.
ÊAdjust the video frequency range using the computer software (see documentation for your computer or your graphics card).
No Connection
Check Signal Cable
The monitor does not recognise an input signal.
ÊCheck whether the computer is switched on.
ÊCheck whether the power cable on the computer is connected to a mains outlet with earthing contact.
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