I currently have my apple TV connected to my iMac, but want to use my powerbook to work with my Apple TV as my iMac is gone out for repair. All my files for iTunes are on a drobo NAS and I have tried pointing my iTunes in my powerbook to the Drobo but nothing changes. All the iTunes library is stored on the drobo so the Apple TV says there is no content unless the iMac iTunes is connected. Can I get it to recognize that the library is streaming though the powerbook as the iMac isn't there?