4 Replies Latest reply: Jun 10, 2009 7:35 AM by mikebikemusic
jem101 Level 1 Level 1 (0 points)
I have an iMac G5 2 Ghz model with a wireless Mighty Mouse and Apple wireless keyboard and have recently been encountering a problem with the bluetooth connections to them on waking form sleep. Although I have searched and found threads detailing similar issues to mine, they have not been exactly the same hence my starting a new topic.

The iMac works perfectly and I can put it to sleep just fine. Later on I can tap a key or hit a mouse button and the machine wakes up. However from that point both the keyboard and mouse are unresponsive, I will get the screen pop-up message telling me that the keyboard and mouse are disconnected, the bluetooth icon in the menu bar is crossed out but the machine itself has not crashed, the clock continues to click up, I have an animated desktop background which continues to play and if I plug a standard USB mouse in, that works.
If I leave it alone (literally for five or ten minutes), then nine times out of ten, the mouse and keyboard will suddenly start working, disconnect again for a few seconds, reconnect and then work perfectly for the rest of the day as long as the iMac doesn't sleep. Sometimes the bluetooth system simply doesn't come back up even after twenty minutes or so and I am forced to hard reset the machine an reboot. From a restart, the system always works perfectly.

What I don't understand is if the bluetooth system is loosing connection when asleep, how comes a tap on the mouse will wake it up ok and then it disconnects?

So far I've reset the PRAM and Power Management systems, trashed the bluetooth preference files and restarted, and run a permissions check. These seem to make it better for a while but the problem comes back. It doesn't seem like a hardware problem in that it all works perfectly while kept awake but I'd be grateful if anyone has any suggestions as to what I can try next or look for.

Many thanks in advance.

iMac G5, Mac OS X (10.5.6), BT Mighty Mouse and keyboard
  • 1. Re: iMac G5 no Bluetooth on waking from Sleep
    MGW Level 7 Level 7 (27,000 points)
    Welcome to Discussions - I was going to immediately suggest a PRAM reset, and I still think you should try another one, also, can you make sure that your BT antenna is securely attached to the module. You should also remove the mouse and keyboard from the BT list, and re-pair them.



    Let us know how you make out,






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  • 2. Re: iMac G5 no Bluetooth on waking from Sleep
    jem101 Level 1 Level 1 (0 points)
    Well this just went from bad to worse!

    Checked the BT lead, looked OK but disconnected it and reconnected it to make sure. Powered up, all seemed ok but bluetooth still not working after waking from sleep. I also tried to reset the PRAM again but even that didn't seem to work any more, only got the single power-up chime - and then the kernel panics started.

    I was getting three or four a day with no obvious reason for it. Often the Mac would not get past the gray startup screen with the Apple logo and the fans going full-blast forcing me to do another hard-reset. I decided to do an archive and install which seemed ok at first but I still had the BT issue and was still getting kernel panics.

    After making sure I did have up-to-date backups of all my data, I did a full format and re-install but the problems remained although less serious. I was still getting KPs sometimes when re-installing software but sometimes when the machine was just idling. Eventually I popped the cover off again, removed both sticks of RAM, cleaned the contact and reseated them. Just for good measure, I pulled the battery out and left it for ten minutes. On restarting, the PRAM had definately now been cleared as the time was wrong, I reset all the settings, finished installing all of my applications and restoring my data.

    So far so good, it's been just over a day and no crashes and the BT works from sleep. I do however have no idea what was causing it-my theory is that the PRAM had become corrupted and when I thought I was clearing it with the control-key combo on startup, it actually wasn't-pulling the battery and/or reseating the RAM sorted it out once and for all.

    Fingers-crossed it's now fixed, early days I know but we'll have to see.
  • 3. Re: iMac G5 no Bluetooth on waking from Sleep
    jem101 Level 1 Level 1 (0 points)
    OK obviously tempted fate by posting, the bluetooth problem has returned!
    While awake both the keyboard and mouse connections are rock-solid, on startup, both connect instantly it's just waking from sleep that's the issue.

    I had the problem just a few minutes ago, the Mac had been asleep for about 30 minutes, I tapped the mouse and it woke up, I could even move the mouse pointer around for a few seconds and then it suddenly froze. The Connection Lost message (for the mouse not the keyboard) appeared on the screen and the bluetooth icon in the menu bar changed to the 'no connection' sign. If I flip the mouse over the little green led doesn't come on.

    After about ten seconds the bluetooth icon changed to normal and the mouse worked-for about two seconds then the whole cycle repeated. This happened three times, the mouse worked for a few seconds, the connection dropped and I had to wait about twenty seconds for it to come back to life on its' own. I tried the volume up and down on the BT keyboard but that wasn't working either. On the third time of dropping, the bluetooth assistant fired up telling me that there was no keyboard attached, just as the mouse resumed working on it's own. It searched for a keyboard, told me that it couldn't find one and then immediately told me that a keyboard was attached and no further action is required.

    And from that point on both have worked perfectly. If it was just the mouse or the keyboard, I'd suspect that was the problem but I find it hard to credit that both would fail at the same time.

    Well I'm now officially stumped. Surely it's inconceivable that a failing BT module would not work on waking but be perfect all the rest of the time?

    Any ideas or suggestions would be gratefully received.
  • 4. Re: iMac G5 no Bluetooth on waking from Sleep
    mikebikemusic Level 1 Level 1 (0 points)
    I'm having a similar problem, but without any bluetooth devices.

    I also have an iMac G5. In the last 2 days it has frozen on wake from sleep 5 times in a row, so I've switched to powering off. It also froze once from power on.
    I hear the hard drive being accessed heavily and the fan going on to cool the system off. Now I'm having trouble with the usb port not recognizing the iPod I just inserted. I haven't figured it out yet, but I believe that if there is a battery in the box, that it may be time to get that replaced, as it may be holding some configuration information that is now getting lost. Haven't tried zapping PRAM yet.