Old thread I know - this is search fodder really.

simple answer : power off, remove battery for a while (a minute), restart.

I've just had this problem and after much hunting it seems that if you have a problem with bluetooth not working and the bluetooth MAC address not appearing in the "about product" then there may be a problem with the BT chip.

I saw:
# dmesg | grep hci
[26616.798797] hci_h4p hci_h4p: Registering HCI H4P device
[26616.930725] hci_h4p hci_h4p: No cts from bt chip
[26616.930877] hci_h4p: probe of hci_h4p failed with error -110

See: https://bugs.maemo.org/show_bug.cgi?id=9895

HTH