As title says above. Just bought a new imac and to my surprise I can't put CDs on so everything needs to be done witht External Hard Drive or USB. Saw some tutorials about how to install windows on external but I have no luck. I followed the first steps downloaded windows support software etc with bootcamp. But when i'm about to install windows on macintosh hd, it says please Enter disc etc etc... Any help is greatly appreciated! Thanks in advance!