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it sounds like the lcd inverter board may have gone bad- its what powers the back light on the monitor similar to a flourescent light. usually its fairly cheap to replace (around 25 used on ebay) typically its located inside the lcd bezel on the bottom center.
monitor could be going bad. plug in the same computer and cable to another monitor. see what you get. same problem? use a new cable on either/both monitors see what happens. this will help you determine if the problem is in the monitor, cable or computer's video output.