Monitor wakeup problems

On G5 w/10.5.5, my Viewsonic VG2021 monitor has trouble waking up after sleeping for the night. I have to turn the on/off switch on and off about 30 times, or for about 10 minutes, before it awakes fully. My desktop flashes on for a split second every other time I press the switch, but will only stay on for good after about 10 minutes of fiddling. My previous G5 here at work had OS Tiger, and the same monitor worked fine on that.
It is NOT the power supply, it is NOT the on/off switch, it is NOT the resolution setting in system prefs. I've ruled out all those things. I think it is software-related, but not positive.
Any help would be appreciated and gratefully acknowledged.

Sorry, I missed that you've checked its operation, since this problem arose, by hooking it up to the other G5 where it worked. I thought you said it worked on the Tiger equipped G5 and that the failure occurred on the Leopard equipped G5 after working originally. If that's the case, reinstall the 10.5.5 COMBO update, reinstall the ViewSonic software, is such is required, repair permissions, restart, hook up the monitor, and see if that fixes the issue

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