Bluetooth on my Sony Ericsson K610i mobile phone does not turn on?

The Bluetooth on my Sony Ericsson K610i cell phone does not turn on. When I press the "TURN ON" button for Bluetooth on the phone, the "BLUETOOTH TURNED ON" message appears alright, but the bluetooth does not turn. It just stays off. I have tried upgrading the phone's software by using the Sony Ericsson "Update Service" software installed on my laptop. I follow the instructions and press and hold down the "C" button on the phone while plugging in the USB cable etc etc. At the end of it all, I get the message that "update was successful.. the software on my phone is up to date, bla bla bla.." But when I turn on the phone and try to turn on the bluetooth, it still does not turn on.
Does anyone know how I can fix this problem?
 
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