IMac 27" extended desktop problems

Hi!
I own a 2011 iMac 27" and I am having issues using a Samsung SyncMaster T240M display as extended desktop.
It works fine when I am just using the computer for a while, but if the displays go to sleep mode, when I return to the computer the iMac display restores right away but then the Samsung display starts to go on and off repeatedly until it finally stays on, but then all my applications are on the iMac display.
It is pretty much like what would happen if I had unplugged the monitor and plugged it back in.
Is there a way to fix this or do I just have to live with that? Has anyone experienced the same problem with other displays? Maybe this Samsung display is not syncing well with the iMac?
Anyway, any help will be very much appreciated.
See you,
JP

If the machine is covered by warranty or even better by AppleCare then contact AppleCare. They will be able to do in-home service if you are within 50 miles of an AASP. You will have to request this service but they will do it.

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