Hi, i am posting this here to see if anyone else has had this issue. I've got both the Magic Mouse 2 and the Magic Keyboard connected via Bluetooth to my iMac (Retina 5K for reference) it's been working flawless since day 1, today i turned on the iMac, get to the login screen but can't move the cursor, caps lock light on the keyboard also isn't working. To cut the story a bit shorter it seems that bluetooth has either stopped working or has been disabled/broken somehow, Bluetooth isn't shown within System Preferences now, just gone - also if i try to open it, it says "You can't open the Bluetooth preferences pane because it's not available", also within System Information the Bluetooth section just says "No information found". I'm currently working with the Magic Keyboard plugged in via USB and an older mouse that has it's own USB bluetooth transmitter. I've tried a basic restart, shutdown and restart, shutdown and remove all USB and power, leaving it for a few mins then plugging power back in etc. Anything else i can do, would fresh installation help? could it just be that something can become corrupt, it's a new iMac (within a month or two) so it's not that it's broke due to age, although things can happen at anytime so i'm not counting that out.