I have an early 2009 24" iMac and my Apple care is about to run out in a little under 2 months. I've never had a problem with the iMac itself and have only used Apple Care to replace the KB/Mouse a few times. One thing I have noticed though is that the screen has some pretty severe screen burn in around the dock area, and some light text burnt in. I also noticed that it has the screen hum when the brightness is turned down. Its not bad but is noticeable. Are these things that I should have looked at before Apple care runs out? Are they going to get worse if I don't do anything about it? Anything else I should be weary of?