Imac G5 screen flashing/blacking out

Hello folks--thanks for your time and help in advance!
Our Imac G5 is just about 2 years old now, and this evening, with very little warning, the screen began blinking in & out. It started just subtly, like a lightbulb flickering, and then a few times went black completely.
The programs that were running (only two--Firefox, with a few tabs open & streaming youtube-like video, and Stickies) seemed unaffected by the blinking. I signed out, shut down, and turned off the power strip. Gave it 5 minutes, and signed back in--only then it was MUCH worse--flickering between on & black almost constantly. Again, the software, though slower, didn't seem affected.
There are no electrical storms in the area (clear skies!), and I can probably rule out power surges, as I'm writing this from our MacBook laptop, also plugged in, with no problems.
Any ideas?

Hi there!
You probably did a variation of an SMU reset: http://docs.info.apple.com/article.html?artnum=301733 - which will sometimes clear up video issues...
I would thoroughly go through this link: http://www.apple.com/support/exchange_repair/imac.html - your machine may fall under one of the serial numbers listed and that may explain your misbehaving display...
Good luck, Rick
Message was edited by: JMEH
FYI - if you depress the button F9 or even scroller ball or side buttons of mouse (if enabled), the screen will darken but the current window will not be affected...

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