Check the cable...if it had turned red, green or blue, I would suspect a bad monitor, but purple is usually a cable that is loose and not making proper contact...
If the cable can be removed, try a new one, if not, it may just be the connector. It could be a bad wire inside the cable, especially if cable is old and has been crushed or bent a lot...
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When all else fails, read the instructions.
Microsoft Knowledge Base
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