Resetting the PRAM didn't work.
Next, I installed the 10.8.5 combo update.
I deleted all of my BT devices.
Bluetooth does not appear in my preferences anymore.
Given the attachments, I'm assuming a hardware issue.
My mini is still under Applecare. Apart from upgrading the Ram to 16 GB and replacing the HD with a Samsung SSD everything else is original. Will the SSD affect APplecare? I don't have the original drive - SMART said it was failing.