TS3048 [SOLVED] after changing batteries: keyboard did not connect to iMac

After changing the batteries of my wireless keyboard, it refused to connect to the iMac.
It took me half an hour to discover that it was connected to my iPhone instead.
So if you ever created a BT connection on your iPhone, make sure it does not interfere with the iMac when you swap batteries...
I simply removed the BT connection on my iPhone.
Hope this helps others.

Please  use Apple's Troubleshooting wireless mouse and keyboard issues located by clicking http://support.apple.com/kb/ts3048. Also it is wise to keep a cheap USB keyboard & mouse around in the event of bluetooth problems.

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