M6400 Video out of sync with external monitor after resuming from power save mode

Hi, I would say 1 out of 10 times, when the Notebook resumes from Display Power Save mode (not Sleep or Standby mode, just simple display turn off), the video will be out of sync, with weird lines and colors, solution, just to put the Laptop in Sleep mode and after resuming from Sleep everything will be ok, I have a Port Replicator and an external Dell LCD Monitor, I've tried with 3 different monitors and the same result, meaning the problem is not the monitor, maybe the Port Replicator or Docking station ?, or the Notebook itself ?, or the Video Driver ?, any idea ?, thanks

 

Please any previous experience, I am having now the issue of BLANK SCREEN on the external monitor, but if I open the Lid and close it back it will work fine again, any idea what might be happening ?, thanks

 

Maybe it's an issue with Powermizer utility from Nvidia ?, I am pretty sure I read once before about the Blank Screen issue, thanks