I have my apple TV connected to the network, the library which is being served up by my iMac to the network shows up in the apple tv under Settings>Computers - it's name is listed there, with what appears to be a 'chain link' graphic (?). But none of the stuff from the library, music, movies etc. shows up on the apple tv. It's worked before, but I recently reset everything, I must have done something wrong. I turned off Syncing, because I don't want anything copied to the apple tv hard drive, I just want to stream things from the imac, as I've done before. Is there a way I might have turned off streaming? thanks!