Apple monitor makes tower go dead

I gave my old G4 with flat screen Apple monitor to my son last year. Recently it went to sleep and never woke up. I can get the tower to come on with keyboard and printer, but the second I plug in minotor, snzzzzzzzzzzzz.
I took my G4 to work and plugged it into a different monitor. VIOLA! It came right on and worked like a charm. So, now I guess I havebad Apple Monitor. Any clues as to what I can do now other than buying a new monitor. The one I have is the lucite encased flat screen that came with the old G4's.

OK< after taking G4 to work and using a different monitor and finding nthat it worked, I brought it back home, plugged the old monitor in and...YOI.. it worked again. So, never mind for now.

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