Why has the bluetooth on my iMac disappeared?

Can anyone advise me how to get the bluetooth icon and options to reappear on my iMac? we connected to a bose system and then the bluetooth icon etc. seemed to disappear.  i cant search for it in systems as the keyboard & mouse are not working. help!

No apology necessary...
SMC=system management controller...reset like this (no peripheral devices necessary):
Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support
Barry

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