Originally Posted by
lynx
The most common cause of this sort of problem is a refresh rate that isn't supported by the monitor.
Check what refresh rates are supported by the monitor.
Then, while using your old monitor, change the refresh rate to one the supported by the flat monitor.
Once you've done that you should be able to swap back to the flat monitor and the problems should have gone. You can swap to the flat monitor without rebooting, so checking the result can be almost instantaneous.
If you can't find any info about the monitor, 60Hz is always supported. Once you've got the thing working you can experiment with different rates, but if you find one that doesn't work just leave it alone and it will revert to the previous settings after about 15 seconds.
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