Just this afternoon my magic mouse stop working. As usual I thought it was a battery problem. However, I noticed it wasn't recognized by the computer. After trying hard to pair it again in the bluetooth utility in system preferences, I noticed it was acting very slowly. This is what I decided to do. I rebooted my computer and used the recovery mode. Using disk utility I tried checking out the permissions and tried to repair them. With no luck and with the whole afternoon free and with nothing else to do, I decided to reinstall OS X Lion. 3 hours later my computer no longer recognizes bluetooth, in the tab it says "Not Available". My mouse is now useless. Thankfully I have an old usb wireless mouse. The unfortunate thing is, I love my magic mouse and really would like to use it again, as it is a helpful tool in Final Cut. Please help! Is there a bluetooth driver I need to install?