Ok, well, on my aluminum iMac I am trying to burn a dvd. Whenever I put the disc in it, the mac does nothing onscreen, makes that noise when it reads a disc, and spits it back out. And I've used these dvd's in the past, they just decide not to work with me today and yesterday. The discs are imation DVD+R 4.7 gb dvds. Anyone want to help? BTW, if you must know, I'm trying to get Windows 7 on it.