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Sounds like either a blown mainpower fuse or the thermal fuse for the power transformer. If the protect circuit was kicking in, the display would light up, but then turn off with a red blinking light. the green light with no display means the transformer is not getting power.
The light should come on steady. Your monitor most likely has the typical failed capacitor problem. The Power Supply board in the monitor most likely has some capacitors that have failed, visible signs include swelling of the ends of the parts, but they can fail without showing any visible sgns. Replacement of the capacitors often restores operation.
power light often means the monitor isn't getting a signal. When you
turn the monitor off and back on, do you see the viewsonic logo for a
few seconds? Try plugging it into a different computer to see if it
If plugging it into another computer doesn't work, it
may be a bad power circuit in the monitor. A common problem with
monitors is the capacitors going bad. If you're handy with a soldering
iron, you can try replacing them yourself. Look here for pictures and
instructions: Fix an LCD Monitor