Today, I decided to reinstall Mac OS X Snow Leopard on my iMac, to have a fresh & new copy of Mac OS. I've done this before on my Macbook, and it worked perfectly. The iMac would not read the original Reinstall DVD that came with it. Instead, it would eject it, though it would work it on another Mac. But when I inserted my Snow Leopard disk that I bought separately, it worked. However, when I entered the reinstall screen, it is extremely slow and I nearly can't use it. I did already use the Disk Utility to erase the hard disk files. So, it is extremely slow, and it wouldn't install either. All I get is the amour of time left, but it doesn't change, just gives me a waiting spinning wheel. It's been stuck on the screen for several hours. The iMac was bought in January, I believe. What should I do?? This is very weird. Should I take it to the Apple Store, or is there a way to fix it?