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It sounds like you've effectively trouble-shot the problem to be your monitor.
You have 3 choices: contact Viewsonic if the monitor is still under repair...or...take it to a monitor repair place with say a $30-50 troubleshooting fee that can be applied to the repair (hopefully)...or...get a new monitor and chalk it up to bad luck.
As far as repairing it, keep in mind that monitor repairs are quite expensive while new monitors are not!
Gary
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