IMac G4 - Black screen (but can faintly see)

I am having problems with my iMac screen. The computer works fine, it's just that you can barely see anything on the display. You need to take a light to it to see what you are doing. I looked everywhere online for something like this, and what I keep finding is "turn up your brightness..." The brightness is at full. I called an Apple retailer and he said that it might be a loose connection or that my backlight is burnt out. I would love it if someone who has had this issue please help me!! Tell me what you ended up doing.
Thanks.
iMac G4   Mac OS X (10.4.7)  
iMac G4   Mac OS X (10.4.7)  

You could try resetting the PRAM
http://docs.info.apple.com/article.html?artnum=2238
but since your iMac has an LCD display, the backlight is probably not working. By the way, this is the forum for iMac (G3) with the CRT (tube) display, so better expertise will be found in the forum for "iMac (Flat Panel)."

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