IMac G4 start up no picture

Hi I am looking at a iMac G4 that has some problems I would like to hear what you guys might think is wrong I would like to point out I am pretty good with computerts and loooking for a project here is what the seller says about it.
"Computer powers up but does not chime, and nothing shows on the display.  I can hear the hard drive spin up, and I can use get the DVD tray to eject, but no video."

if the lcd is broken could I use a cinema display lcd for a replacement?
or could I mod a another lcd to work?    
I forgot the add that this is a 20" iMac and thats why I'm wilkling to work on it.

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