External monitor Syncmaster 2494SW not working after 10.6.7 update

External monitor Samsung Syncmaster 2494 SW stopped working after 10.6.7 update on 2011 MacBook Pro. I'm using miniDP-DVI adapter. The monitor shown correctly in Display Properties with right modes and name. MackBook recognizes connection but the monitor goes to PowerSave mode (LED indicator blinks).
Safemode boot, SMC reset, PRAM reset did not help.
Exactly the same setup works perfectly under 10.6.6.

HERE IS THE EASY FIX SOLUTION FOR THIS PROBLEM GUYS:
I have an 15inch MacBook Pro that I've just installed Snow Leopard 10.6.3 on.
Prior to this install, I've had it hooked up to my Samsung SyncMaster 2243 via an Apple MDP/VGA adapter and a third party VGA cable. It has been flashing on and off a black screen every now and then for the past 2 years and I googled that it was just a crappy communication between the MBP and the Samsung... but now since installing 10.6.3, the Samsung display just flashes the desktop for a second then turns black for good - occationally flashing analogue/digtal prompt display. Tried everything for hours. Nothing worked, thought I was gonna have to buy a new all Apple VGA lead then came across Michael's above solution. Tried it and it worked IMMEDIATLY!!! And the monitor doesn't flash black anymore AT ALL!! Whoo-hoo!! Thanks heaps.
WHAT TO DO TO FIX:
Go to => System Preferences => Energy Saver => change graphic settings to Higher Performace.
Cheers!!

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External monitor Syncmaster 2494SW not working after 10.6.7 update

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