This is a very common problem with that version display. It was usually the power brick actually. There is a short cut... but it may be a fire hazard in and of itself. The power brick doesn't put out as much juice and the display thinks there isn't enough current and starts the dreaded coded flash.
I did the paper trick and it worked... but I only used it till I got another display.

All sizes of those lucite monitors had this problem.

I have 2 torn down in the back room of my studio ... on a shelf. What a waste.

https://discussions.apple.com/thread/2086442?start=0&tstart=0
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