Top 1/3 of screen darker then the rest..  23" HD

A few weeks ago the top 1/3 of screen got darker then the rest.. It seemed to go in and out from 100% to dark for about a week and now it is just darker. The monitor is still usable but it gives me a head ache after a while of working.
Can this be repaired by apple? Any suggestions would be greatly appreciated..
Thanks and happy holidays....

Happened to me and I thought it also was the upper cfl tube, it got progressively darker by the week. Instead of changing the cfl tube, I swapped the inverter board from an exact model that was used for parts. I figured that an inverter change was much easier to do and it was and the problem was solved, works like new. Sometimes it is not always the tubes that go bad, the inverter board is divided into 2 sections, one for the lower tube and one for the upper one that supply the tubes the voltage. If voltage is weak, so are the tubes. If the power button on the monitor flashes it is almost a sure sign of inverter problem. Tubes and inverter are really not that difficult to change, just the right size allen keys and a philips screwdriver and a little patience. Check out moniserv.com for schematics and parts. They also have some very useful suggestions.

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