I am a new owner of an OSX mini 9 with built in bluetooth. I noticed that BT
can't be turned off from OSX and did some googling and read that it may be possible to turn it off in BIOS. I got brave and followed some instructions that said to hold down F2 at the Dell logo during startup. That did bring up some text but I didn't know what to do from that point. I'm a little worried that messing around with it might end the OSX startup if I do something wrong. I just got out of there by restarting and kept my fingers crossed that I hadn't screwed something up. Fortunately, OSX booted up just fine.