Wavy colored lines on screen - little like a photoshop selection effect

Hi All,
This morning when I woke my 20" intem iMac from it's sleep, I was presented with a screen full of wavy "ie moving" curved lines moving around the screen. It looked a bit like a selection in an image editing program like photoshop. In all other respects the machine was working fine. Anyways, after mild panic and a few reboots, no dice, still wavy lines.
I did notice that the initial mac icon as it booted looked normal, then the wavy lines kicked in, so I had a little hope that it wasn't a hardware problem.
Long story short, resetting the PRAM (commandoption+PR) during reboot fixed it for me. Phew.
Just thought I'd post in case someone else runs into this problem.
Cheers

Ah, yes, the usual reason not to give up a computer for repair. They might simply replace your display, leaving you with the rest of the unit and original hard drive in place. There may be no problem occur, but it's always wisest to be prepared for a repair failure and back up prior to giving up the machine. While the repair personnel might be interested (or not) in protecting your interests, I'd keep in mind that they're only human and do make errors.
I don't know what will happen next if you choose to do nothing. What if the problems escalate for you and you end up losing everything on the hard drive - are you backed up and prepared for that possibility? Not fair, I know, throwing the doomsday scenario at you, but .... your decision.
Edit-
You might want to check the warranty language, as I imagine that Apple won't agree to be responsible for your data, even if they try to help you out in that respect during service.

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