Apple 20" display vertical & horizontal lines on G4

I have just brought a 20" apple display, to connect to my G4(MDD), I connected it via the ADC (after checking on the Power Mac G4: Display compatibility from apple) and all I get on the screen are horizontal and vertical lines, I cannot even see the desktop. Why is this? and what is it caused by, is my only option to buy the DVI to ADC connector?
Thanks

I'm having the same problem. The computer is unusable, I can't see almost anything. The computer runs fine, its just that the display is all messed up.

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Welcome to Apple Support Communities
The display or graphic card are damaged. The only thing you can do is to take your computer to an Apple Store or reseller to get your computer repaired.
If you use an external display with your Mac, connect it to your computer and see if these lines appear on the external display. If so, it's a graphic card problem

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My MBP has only been 14 months, and the display already started to have problems.
There was this thin 2-3 pixels horizontal line appear on the displayed middle of this month (NOV 2010). It was gone after I reboot the machine.
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Apple 20" display vertical & horizontal lines on G4

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