Bluetooth completely lost on both keyboard and mouse

I have an Apple wireless keyboard and MacMice The Mouse BT, used with an AL15 PowerBook, OS 10.4.6. Recently both devices became inaccessible. I have tried re-setting up the devices, changing batteries in them, turning BT off and on, restarting PB etc.
Whenever I try to set them up, it says: No keyboard has been found, make sure your keyboard is discoverable.
When I press the connect button on the mouse, it goes to the next screen, but then says pairing was unsuccessful, make sure mouse is turned on on discoverable.
I do have discoverable checked in BT prefs.
PowerBook 15/SD   Mac OS X (10.4.6)  
PowerBook 15/SD   Mac OS X (10.4.3)  
PowerBook 15/SD   Mac OS X (10.4.3)  

Hi,
Have you guys had Virtual PC installed?
I had similar experience when I tried to install the Virtual PC a couple months (perhaps, half a year) ago (so my system might be 4.6 or 4.5 then). After the installation on my PowerBook G4 (1.5 GHz), I found that my bluetooth had comletely gone! I could no longer connect to my wireless macmouse (well, I don't have a wireless keyboard). So, I decided to remove the Virtual PC, and reclaimed my bluetooth and mouse connection back.
A few days ago, I decided to give the Virtual PC another try since I need to run some window-specific programs. This time, I had my wireless mouse connected through my installation (last time, I did not). But, after the restart, I still lost my mouse connection. Though I can see the bluetooth is still on my system, I have no way to get my mouse paired again! I had since tried searching online to see if anyone had similar problems and hopefully any fixes, but got none so far.
Nevertheless, I got lucky today. I tried connecting my wireless mouse with my wife's MacBook, and it works great, so it's not a fault mouse or battery. Then, I tried it on my PB G4, and it just came back!
Well, the above is my experience. May not be of any help to you guys. But, if you happened to have Virtual PC on your mac, you may try my steps, i.e.:
1. Completely remove it to see if you can get your bluetooth back.
2. Make sure your wireless connections are on when you install the Virtual PC, and later to see if the BT is still there after restart.
3. If yes, try to find an Intel-based mac to get your wireless devices connected. If the pairing is successful, you may have chance to get them back on your "old" mac.
Good Luck,
JC
MacBook, PowerBook G4, iMac G4   Mac OS X (10.4.7)  

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