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  • 4 months later...

It's not a pretty solution, but here's the answer I've found to work on three different systems I have setup...

 

sudo rm /Library/Preferences/com.apple.Bluetooth.plist

 

that's it... remove the file and reboot.

 

I've noticed on my machines that this problem occurs while trying to pair with my BlackJack phone so I can use PAN networking. The pairing begins, runs into some error then appears to work OK. On reboot I get the grayed bluetooth icon and have to use Applications->Utilities->Bluetooth File Exchange to power-on the adapter. My guess is that the interrupted pairing in my case is causing the preferences file to become corrupted in some way which doesn't allow the bluetooth to startup as usual, but that's just a guess so it's probably not even close to what's really happening.

If you have a BT dongle with a button on it, try holding the button in AS YOU PLUG it into your machine and KEEP HOLDING IT for an additional 2 seconds. This swtiches the internal device ID of some devices that have a dual mode configuration for legacy keyboard/mouse compatibility with older BIOSes.

 

This holds especially true for most Logitech MX desktop and DiNovo bluetooth dongles.

  • 3 months later...

I have a cheap bluetooth usb dongle from eBay. It used to work fine with leopard, but recently it started to be turned off at boot. I removed the plist as suggested above, but now there's no Bluetooth icon in system prefs. Also when I plug the dongle in, the menu bar bluetooth icon still shows as not available, and Bluetooth file exchange says "No Bluetooth hardware found"....

 

The dongle still works fine on my iMac G3.

 

Help please?

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