MacBook not recognizing Bluetooth?

I have a brand new MacBook (approx 2 months old) that I have successfully paired with my cell phone using the built-in Bluetooth. This is really all that I use the Bluetooth for - sending pictures between my computer and my phone - and I haven't used it much lately. Recently I tried to send a picture from my MacBook to my cell phone and my computer tells me that the "selected communication device does not exist" - basically that I don't have Bluetooth in my computer! What has happened and how do I fix it? How do I get my computer to recognize it's Bluetooth and to connect to it again?

Message was edited by: ellasaurus