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Firstly - Is the cabling, mains and data cable, securely attached at both ends and the power turned on at the mains?
Secondly - If so when you press the monitor power button, does a light come on? (often orange coloured) If yes does this change colour when the computer starts its boot sequence? (often to green or blue)?
If no light can be obtained it is likely that the monitor is faulty.
If a light comes up on power up, but doesn't change colour during the computer boot sequence then it is more likely to be the graphics card that is faulty, or sometimes the computer PSU.
The easiest way to find out whether the computer or monitor is at fault is to replace the existing monitor with a monitor that is known to be in full working order, for example from another computer. (Or connecting your monitor to a computer that is known to be working)
Having isolated the faulty component it can be replaced and you should be up and running again.
Hope this is helpful, if so would you please register that with Fixya
GNR TS902 19 inch flat screen computer monitor with 3x4 aspect ratio
Difficult starting or completely dead:- (This is a 'Stock Fault' with these otherwise excellent monitors)
Check or replace the electrolytic capacitor C829 - type 1000MFD 16 Volt DC Wkg It sits on the PSU board next to an empty "C817" mounting point (which is for a device wired in parellel) so you can fit two smaller ones (of ~ 500MFD each) . . I suggest replacing it (C829) with a 1000MFD25 VoltDC Wkg type.
Also (very much less frequently) capacitors C802 - 470MFD 50V VoltDC Wkg and C819 680 MFD 16 VoltDC Wkg are faulty.
The video resolution setting is done AT THE MONITOR DISPLAY PROPERTIE SETUP, not at the monitor. The video card driver is up to date?
What OS are you running?
If you are running Windows 7, you need to find driver for this model.
Signal OVER RANGE? Monitor unable to cope with the frequency the computer is sending (for want of a better explaination. Boot the computer to VGA mode and adjust the display settings, or boot to safe mode
Seems that you have set the resolution on your graphics card to a
setting higher than the maximum resolution supported by your monitor. Try
to boot into Safe Mode & lower the resolution of your graphics
card. If not possible, go to Device Manager & remove the graphics
card from it, then reboot your computer. This will reset the resolution. You can then re-install your graphics card drivers & get it to work properly.