IMac G4 display lights up but shows no image

We were recently "waking up" our iMac G4 17" when we noticed that the display would not show anything. We could still here the OS sounds (email coming in, etc.) but nothing was showing up on screen. Thinking the display had died, I tested the brightness setting (we normally kept it pretty low) and when going to full brightness, you could see the backlight of the display working perfectly. It was essentially brightening up a black screen. So this tells us that it's not the the backlight died.
I restarted several times, reset the PRAM several times, and still the screen is dark with the backlight on. Could be as simply as something coming unplugged inside the machine (we never move it)? Is this something that can be fixed? Any input would be greatly appreciated. We love our iMac G4!

Hi-
Welcome to Discussions!
The symptoms you describe could very well be the battery. It could also be a power supply problem, or the power button board.
I would consider a $4-$5 battery to be worth trying. 5 years is about max life for the little battery.
Also, check your connections, and follow these instructions for resetting the PMU. If you startup fine after the reset, I would definitely replace the battery.

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