Aluminum imac 2.4ghz bluetooth missing from system profiler

Now used to have my phone a nokia e61 paired with my imac a few weeks ago i transfered photo across but recently that the bluetooth icon in the menu bar had been grayed out and the system profiler doesn't have any bluetooth info, i've don't a firmware update recently but I don't think that disabled the bluetooth, ideas or help would be much appreciated.
thanks Ade

As Eustace says, it's likely a hardware fault, although the following suggestion worked for me when I helped my neighbour who lost all BT connectivity on his iMac a while back.
Apart from the Magic Mouse what keyboard do you have - wired or BT?
To do this you might need to use a wired mouse/keyboard just in case you lose your limited BT connectivity and end up not being able to log in. In Macintosh HD>Library>Preferences, do you have this file:
com.apple.Bluetooth.plist
If so, move it to the desktop and restart. If BT does come back to life this is where you might need the wired mouse/keyboard to get your BT devices re-connected. If this works you can dump the file you moved to the desktop.

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