External Monitor Flashing to Black

PowerBook G4 15" 1.67 GHz with 2 GB DDR2 SDRAM running OS X10.4.11.
I'm attaching a Samsung SyncMaster 205BW using DVI cable that came with monitor. My Mac is recognizing this as a SyncMaster and I am using the display settings it defaulted to. I am using the notebook's built-in screen at same time as the SyncMaster (not mirroring). In the displays preference pane I have the monitors arranged with the SyncMaster above the notebook's display. The menu bar is at the top of the SyncMaster and the dock is at the bottom of the notebook display.
For some reason, after a few minutes of use the SyncMaster will start flashing to a black (blank?) screen as if it is not receiving a signal. It will then come back after about a second. Once it starts, the problem becomes more and more frequent as I use the monitor. However; if I unplug the DVI cord from the PowerBook and wait for the built-in screen to reset, then plug the DVI cord back into the Mac, the problem will go away again for several minutes.
I have not been able to duplicate any particular action or application that triggers this.
Any and all suggestions for fixing this are appreciated!

Hi DJ
I had a similar problem with my acer display, it showed up, that it lost synchronization of the refresh rate somehow sometimes. For me the fix was to download [SwitchRes|http://www.switchres.info/html/SRX/DL.shtml], setting some different vertical refresh rates (from 60Hz to 68Hz) there, restarting the Book and then selecting 62Hz within the SysPrefs/Displays window. The nominal refresh rate of my display is 60Hz but this ended with a total blackout, it works steady with 62Hz. After this procedure I could delete SwitchRes and ApplicationEnhancer that came with it, the custom refresh rates remained. Be aware that ApplicationEnhancer caused some troubles with OSX 10.5.
Good Luck P

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