C8180 refuses to recognize BT300 or BT450 dongles

My new Photosmart C8180 has just (suddenly) stopped recognizing the BT450 dongle (marked bt400) we had in it.  I've tried the BT dongle in another printer and the dongle works fine.  Also, another BT dongle, a BT300, gives the same error in the C8180 and works fine in all other compatible HP printers.
WHen either dongle is put in to the printer, the printer screen shows "Unknown device..."  On HP Solution Centre the error message is "Only a pictbridge compatible device...."
This is the second C8180 I've had with problems.  
Very unhappy by now. 

The C8180 has built-in Bluetooth, and doesnt need a Bluetooth dongle to be inserted into the PictBridge slot. Just turn on the Bluetooth radio using the Bluetooth menu in the Setup Menu, and that's how you turn on the bluetooth on the printer.
Make it easier for other people to find solutions, by marking my answer with \'Accept as Solution\' if it solves your problem.
Click on the BLUE KUDOS button on the left to say "Thanks"
I am an ex-HP Employee.

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