Monitor enlarges display unexpectedly and goes black

I have had my preferences set for a long time, for display to 'sleep' after 5 min. Recently for no reason while I am working with mouse or keyboard, monitor will enlarge the screen image as it goes black.
Sometimes, I can turn the monitor off and then back on to resolve the issue.
Other times, I have to turn the monitor off and on 3-4 times.
If that doesn't work, I have to push the shut down button on the PowerMac,
and then push it right back on.
Recently, I also got a message to set date and time manually as these were prior to current date. Someone has replied to that issue that a failing pram battery could be the cause.
Could the battery be affecting function of the monitor as well?
How can I troubleshoot the problem?

I assume that the display is a CRT-type and not an LCD. From your description of the picture enlarging and then the display going black, I'd suspect a problem with the flyback transformer, which is responsible for producing/regulating the high voltage that drives the screen. Needing to repeatedly power OFF/ON the display to bring the screen back would support this diagnosis. Because of the shock hazard associated with diagnosing/repairing this portion of a CRT display, a trained professional should do it. It would be less expensive to replace it with a flat-screen display, than pay for the repair.

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