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Actually, the ultra high voltage 'charger' for the florecence (a.k.a. your back light)has gone Kaput...
If your lucky, someone will have a monitor like yours that has the back light come on, but no picture (should get a similar blinking light situation, but a different code. Like... blink, hold, blink blink, hold, blink). In this situation (if your comfortable doing it) you can swipe the exciter from that monitor and put it in your monitor. Obviously this is a more economical way of repairing the monitor.
Just to be on the safe side (as the repair is blindingly easy. 6 screws, pop out, pop back in) DON'T touch any of the back side components. You WILL shock the supreme **** out of yourself. Between the heavy duty capacitors and the ultra high gain transformers on those things you could jump start a bus. So don't be fooled... those little transformers pack a mean sting.
My VX924 did the same thing but now displays nothing and power switch light just blinks. According to an answer listed on previous page, it may have bad capacitors. I may have to take a look at them. Viewsonic repair facility examination of this monitor runs $70.
I don't know what might have happened, but a number of years ago I had an apple monitor and the power light on it started blinking, so I got in touch with apple and they told me that it's flashing an error code, so they told me what the blinking indicated and fixed it.
So I think the blinking of the power light on your monitor could be indicating an error code so I suggest you call apple and they will identify what the error is indicating.
Hummm. Try to unplug everything, reconnect, than restart. If not working, try to plug your monitor on a different computer to diagnose what is wrong, the computer or monitor. It could also be your graphic adapter, verify that it is firmly attached to the motherboard.
Lastly, replace the defective part.
This is most likely the power inverter board in the monitor - this is common in many monitors. If it started taking longer and longer to display an image, and the power light is blinking on-and-off, that's the problem. You can confirm that it's the monitor and not your computer or the cable by plugging in another monitor if you have one to try.
If it's under warranty, send it back, if not, there are inverter boards for many common models of LCD monitors that are replaceable. The board can run anywhere from $50 on up. Depending on how old it is, you may find it better to just replace it with a gently used one from ebay.
Sounds like the backlight inverter board.
It's a very common problem.
LCD's use four small Cold Compact Fluorescent bulbs to back light the display. (thats what gives the LCD it's brightness allowing you to see it)
The inverter board runs these lights and when they go bad they will typically show symptoms like you have or the monitor power light comes on and you have either no display or a very dim display.
If you ever have one that has no display but the power light is on you can check by shining a flashlight directly into the LCD from the front (right into the screen) if you can see an image then it's either the inverter board (most likely) or the CCFL bulbs have gone bad.
The inverter board and CCFL's are replaceable.