External Monitor flicker... HELP !!!

iMac9,1 with mini DisplayPort to VGA external LG-W2242 in extended screen model.
Used to work well; recently flicker at 1680x1050.
This problem happens only at 1680x1050, and it is now at 1440x900 and is working.
But, the resolution is not the monitor optimum resolution at 1680x1050.
Not keen with SwitchresX or DVI solution.
Grey unselectable at 56 or 75Hz, how to activate this selection?
Or any other alternative solution?
Thanks

Finally, I did more research and confirm that the problem is not related to Hardware.
It does not matter if you have Apple Mini DisplayPort to DVI Adapter or VGA Adapter.
I had in other thread, and understand that SwitchResX can solved this problem.
https://discussions.apple.com/thread/2387462
It has to be a OS problem, I tried it today with SwitchResX; and confirm that it can work with 1680x1050.
https://discussions.apple.com/thread/2650682?start=30&tstart=0
Sadly... Mac OS X10.6.8 brings back some of the older external montior flicking problem.
Apple technician... if there a patch fix, then, to purchase third party software to patch the OS problem??

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External Monitor flicker... HELP !!!

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