Black lines on my iMac G5

Hi - I have a problem with my iMac G5 (PPC). There are black lines and dots around most things (see screenshot). I have restarted the computer and turned it off - unplugged it, etc, hoping it would do something but these lines appear over icons, the mouse cursor, the dock and some applications are impossible to use such as iWeb and iPhoto as the lines obstruct 90% of it. Other applications like iTunes and Safari are fine.
Has anyone had this problem? What can I do to resolve it? Thanks!
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Thanks - I turned it off last night and kept it off all day and the lines were still there so I reset the PRAM and unfortunately it made it worse. I can hardly see a thing now. The grey screen and blue screen are perfect when I boot up but the second the login box appears it goes weird. When I move the mouse now it leaves black dots/lines where the mouse has been so after a few minutes of moving it around the desktop it's hard to see anything. Not to worry though as I have managed to locate the back-up option in iTunes and am currently backing up my precious music before it totally gives up before I have the chance

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