Reset PMU worked.... but....

The screen has darkened again. I will try resetting PMU again, however, I am concerned that at some point this won't work.
How do I determine the cause of my monitor going dark (hard drive is running but monitor remains dark)? This computer suits our needs just fine, so I'd like to keep it going as long as possible.
If fixing is cost-prohibitive, can we hook it up to an external monitor?

Unfortunately the troubleshooting in the Apple Service Manual is basically willy-nilly board changing until it works. I don't even think Apple is sure what the cause is and I believe the problems and expense of fixing was a driving factor for the iMac G5 not having such a complex neck arrangement. 
You can connect an external display.
For a 700/800MHz iMac you can connect a VGA display of either 1024x768 (15" iMac G4 models) or 1440x900 (17" iMac G4 models) other resolution displays are not recommended as Apple crippled the video card.
For a 1GHz, 1.25GHz iMac you can connect either a VGA display or any video device (like a TV) via S-Video or Composite Video. Again 15" iMacs should have 1024x768 external display, 17" iMac G4s a 1440x900 external display or 20" iMac G4s a 1680x1050 external display.
There is a hack to remove Apple's deliberate crippling of the graphics, but it is risky (although I've never heard of a failure). This would allow an external display of pretty much any resolution up to about 23"/24" models.
iMac G4 (Flat Panel) 1GHz/1.25GHz:
Mini VGA - VGA
Mini VGA - Composite/S-Video
iMac G4 (Flat Panel) 700/800MHz models:
Mini VGA - VGA
mrtotes

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    ↓ Did my reply answer your question? Accept it as a solution to help others, Thanks. ↓

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