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#11
In case it was not obvious, it does not need to be another computer, anything capable of outputting video will do - games console, DVD player etc. etc. The idea is to confirm whether the problem you are facing is with the monitor or your computer, if we swap your computer out for another video source, it should determine which it is.
Another option is to try power resetting the monitor. Disconnect the power lead and hold the power button down for about 30 seconds, then reconnect to power and turn it on.