Currently Being ModeratedFeb 25, 2013 8:54 AM (in response to Brett Dawson)
I'm going to tell you how to fix this for a modern iMac using Lion or Mountain Lion. Your profile says you're using an iMac G4 with OSX 10.3 (Panther). I don't know anything about Panther, so my suggestion may not work.
Go to System Preferences>Bluetooth
You will see a list of devices that are currently connected (it will say so), or a bunch of numbers (usually with no name) that probably were connected in the past. Just highlight them and click the "-" button at the bottom to delete those profiles.
I bought a new iMac but switched out the Bluetooth Keyboard and Mouse for a USB keyboard (need the numbers pad) and a Trackpad. But during manufacturing, they paired the original Mouse and Keyboard to my iMac, so they remained in the profile. One day, on startup my iMac was searching for those two items, which blocked the use of my keyboard. I finally remembered something about this from a problem I had a few years ago, deleted the profiles, and now it works.
Give it a try.
Currently Being ModeratedFeb 25, 2013 9:04 AM (in response to OrangeMarlin)
That didn't work for me. The only Bluetooth device that shows up is the wireless trackpad. This keyboard is the one that came with the computer when I bought it (I opted for the USB keyboard because I frequently use the calculator pad on the side).
Currently Being ModeratedFeb 25, 2013 9:12 AM (in response to Brett Dawson)
OK, in the same preference panel, turn off discoverable (it's possible it's trying to find another bluetooth device somewhere). And then click on Advanced, and click off "Open Bluetooth Setup Assistant at startup if no keyboard is detected."
If you ever need to add another Bluetooth device, just remember, you'll have to turn on discoverable.
Currently Being ModeratedFeb 25, 2013 9:23 AM (in response to OrangeMarlin)
Still not doing anything for me. I've checked and double-checked that the keyboard works. I can plug it into my MacBook Pro and it recognizes it fine. And the USB ports on the iMac are definitely functional.
Currently Being ModeratedFeb 25, 2013 9:28 AM (in response to Brett Dawson)
Well, I still dont' know if you have an ancient Mac with an ancient Mac OSX. If so, I'm not sure what else to tell you.
If you have a new one, then go to an Apple Store and get it fixed. I'm out of ideas.
Currently Being ModeratedMar 12, 2013 1:30 PM (in response to Brett Dawson)
This same thing has happened to me, it's really frustrating. I called Apple Care and they told me that I got a faulty keyboard and should take it to the Apple Store to be replaced. See my discussion here for what happened to me: