Mighty Mouse bluetooth disable after computer shuts down

I looked for a solution on the forum and could not find it yet. I have a Mighty mouse connected to my G5 Mac tower for almost a year and never had a problem. Now since last week, every time I shutdown the computer it disables the bluetooth hardware. Then when I turn on my computer, my wireless bluetooth mighty mouse does not work any more. I then need to connect the old wired mouse go back to system preference, go to the mouse keyboard section and select and re-program the wireless mouse. At that moment it gives me a message that the bluetooth hardware is off and ask me if I want to turn it on. When I say yes, turn bluetooth hardware on, then the mighty mouse starts working again until I shutdown or restart the computer. Just as an additional piece of information, my G5 Mac tower is a three year old that did not come with the integrated bluetooth technology. I had been using for a year a D-Link DBT-120 USB bluetooth device. As I said, never had a problem until last week. Does anyone has any idea what could had changed on my computer?
Thanks.

Hello again:
The reason I asked about changes is that an update "may" have affected the external BT dongle in some way. Both my iMacs have built-in Bluetooth capability, so I am very little help with third party dongles.
You could reset the PRAM to see if that helps:
http://support.apple.com/kb/HT1379
Barry
Barry

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