Screen goes blank - need help!

Some weeks ago the screen on my iMac started to go blank. The only way to recover was to re-boot. The problem got worse until the machine became un-usable. I tried everything I knew, including switching off and unplugging to reset the pram as suggested, but eventually took it to the Apple Store where the 'expert' reset the pram the old way holding down the cmd/opt/p/r keys on startup. Problem solved (why do Apple give bad advice to clear the pram?).
Something had corrupted the software that drives the screen. The only program that I could think might have done that was ScreenRecycler which I have now stopped using. However, the problem has started to re-appear, the only new program I have used is Audirvana which being a music program should not affect the screen.
Has anyone else had a similar experience? I would welcome any thoughts and advice.

AFAICT, Apple's advice matches what you stated the tech did. All I can suggest is to Zap the PRAM and Reset the SMC, then try again.

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