15" Apple Studio Display Shutting Off

My Apple Studio Display (LCD 15", purchased 2000) visual display is intermittently shutting off. Audio remains functional, and I can still type while the display is absent and when it comes back what I typed (ie, on a word doc) is there. The screen saver does not come on during the loss of visual display - the screen just goes black. When I move the mouse around or hit the keyboard repeatedly, the visual will come back. There are not problems with the display when it is visualized. Here's what i've tried so far:
1. All connections are secure on the ADC cable.
2. Tried restarting computer several times - no avail
3. Checked the display settings in system prefs - energy saver is @ 15min.
I'm wondering if the problem is the monitor or something with the computer. I read somewhere in discussions that PRAM batteries can be a problem (mine has never been changed and I don't know how to reset).
Any suggestions would be appreciated. I really hope to continue to use my monitor!!
Mark

Do you hear a zapping sound when it happens? It could be high voltage arcing. Blowing out dust might help.

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