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This could be a number of things so you'll have to be patient with yourself. Try to check out your cable first by plugging another monitor on to the cable. Or you can attempt to plug your monitor and cable into another computer. Usually there is a power light on the monitor which changes colour when the monitor is receiving a signal e.g. orange when the monitor is powered up and then green when it is powered up AND receiving a signal. If you have more than one video outlet on your computer try both. It is most unusual for your pc not to recognise another device at the end of your video cable - are you using Windows?
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