URGENT HELP NEEDED: iMac screen suddenly going half dark?!

Hi..
So earlier tonight I was using my iMac perfectly, then had to stop since I was going out with friends for dinner and to see a performance and when I came back, shook my mouse awake my screen came back on from it's sleep mode and was fine and then the top half dimmed.
I tried messing with the lighting because I thought maybe my roommate's cat may have stepped on it, but it was at 100%. I rebooted, turned it off for 5 minutes then turned it on again and it comes on fully lit for a split second then dims at the top again. It's not black, but you can see that the screen has dimmed a lot. I'm attaching a picture, hopefully you can tell what I mean. It's a kind of crappy phone pic but that's all I have right now.
I bought this iMac in May 2007, so I doubt I have any warranty left and I can't remember or find paperwork to see if I bought apple care protection.
Does anyone know what this could be? I've read on another forum that it might be a back light going out. Any idea how much that would cost me?
Thanks!
Message was edited by: CallyKhS

Well, some questions ?
I'm just another user and no expert, but:
*Might not want to shut it down until you have backed up your data, First!*
1.) Does everything else run good? --if "beach balling" badly, call an expert and I wouldn't shut it down or sleep it.
2.) Is there a hardware test you could run? --each version of OSX generally has something like disk utilities you can run. Try apple's downloads page for useful 3rd party utilities, assuming you can run them o.k. and everything "seems" fine except for screen.
3.) Do you have it plugged into a surge protector? --sometimes they get used up. You could (after verifying hardware and preferably backing up data) try it on another wall socket in another room, to check electrical viability. You might have a bad or dangerous wall outlet. If the wall gets really hot above the outlet, have it checked out immediately. Houses burn down every day from bad outlets and old aluminum electrical wire. (lol, I'm not saying anything bad about your house.....just trying to cover the basics).

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