Why does my iMac display keep shutting off?  Computer still running in the background.  I've tried unplugging and restarting, to no avail.

Why does my iMac display keep shutting off?  Computer still running in the background.  I've tried unplugging and restarting, to no avail.    The computer is well out of warranty - about 7-8 years old, running 10.6.8

Checked.... the settings had not been inadvertently changed, but I did move the scroll and reset them back to the original.   Hasn't shut off again.... yet.   Will re-post with follow-up one way or the other.   Thanks.

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