Hi, I've had an issue with airdrop since migrating a 2008 iMac to a 2013 iMac. It's never worked for me on this 2013 iMac, however both iPad Air 2 and iPhone 5s have no problem airdropping between each other and other 2012/2013 iMacs. I wonder whether migrating from the 2008 iMac has left some bluetooth settings over? I tried a clean install of beta El Capitan today and still no airdrop. Is there a way to hard reset all bluetooth settings? I've reset PRAM, etc etc. No luck. System report shows somethings that look like they might be a problem: Discoverable: Off - should this say on? Airdrop and System Pref > Bluetooth say iMac IS discoverable Any help would be much appreciated.