I have several questions related to my new iMac 27''. First of all, I have a severe yellow tinge everywhere but the top left. Second, the hard drive makes loud grinding noises while booting. I will take it to the Apple store to have these looked into, but I have no faith that if I RMA'd to Amazon and got a replacement it wouldn't have the same problems. My other annoyances relate to the wireless keyboard and magic mouse. The keyboard works fine within OS X, but while it is first booting, if I hold down the Option key, nothing happens. Within Windows 7, it refuses to work at all. I did get the Magic Mouse to work for half an hour, but when I rebooted, it stopped working. I have installed the Bootcamp 3.1 update, but that didn't fix anything. I'm really getting frustrated with this computer. I want to love it, but there are so many problems with it. What should I do?