Just got my 20" Rev B iMac yesterday. Everything went well until I put in a DVD with my backup stuff on it. Took awhile for the drive to read the data, and after I was done, it refused to eject. I had to restart to get the disc out. I tried it with other DVDs and had the same problem. Worked OK with CDs, though I only tried a couple. Anyone having the same problems? I'm going to return my iMac today for a new one.