I don't know for sure because I don't own nor have I ever used one of these monitors before but this error likely means that either that there is a problem with the resolution or the frequency coming from the video card on your computer. The recommended resolution is 1280x1024@60Hz.
You can hook your PC up to your old monitor and check the Display Settings. According to the manual for the LG1780U (and many others) 640x480, 800x600, 1024x768 and 1280x1024 should all be acceptable values, although 1280X1024 will give you she sharpest image for this monitor.
If you still need help LG offers 24/7 tech support @ 1-800-243-0000.
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Hi there, my name is Alex and I am here to help solve your problem.
When adding a new monitor to your computer, it is not necessary to install the monitors drivers as it should detect 'Plug and Play monitor' and will install the monitors drivers automatically. Are you getting any error messages?
If you have any questions or needing further assistance, then please contact me.
some games need high resolution. Monitor resolution not supporting for this game.
Powersaver mode showing when the main PCB of the monitor failed. check this link to get the service center info http://www.lgservice.com/