Blue Tooth interference between two IMacs

I just purchased the 27" retina IMac last week and I moved the old IMac #1 with same Yosemite 10.10 to another room 30 feet away.
The new IMac #2 goes crazy when the old iMac #1 is turned on. The mouse will freeze up and the keyboard gets dis-connected.
From the new IMac I tried to disconnect IMac #1 from bluetooth devices but it comes back. I tried to pair keyboards but they are not found? I have paired each mouse in blue tooth settings on each computer.
When I shut down the old IMac #1 all is fine on the new IMac. Not the answer but have on order wired mouse and keyboard for old and will turn off blue tooth on that computer.
I spoke with Apple tech and he didn't know what was wrong.

jcbear:
I've had the exact same problem that started about the same time as your post (Nov/2014). I was finally able to speak with a great senior level tech at Apple that understood the issue and who walked me through some steps that appear to have solved the problem. You will need a USB mouse to do it because you have to turn the bluetooth off temporarily but still be able to use a mouse. Basically he said it seems to be a pairing issue that doesn't normally occur because once a mouse or trackpad is paired, it should not be discoverable to other bluetooth signals (like my other iMac). So my understanding of what we did is turn the bluetooth off, erase all the bluetooth settings, reset the computer by unplugging the power cord for a while, and then start it up again to let my mouse and trackpad re-pair. Neither one has dropped the connection since and my other iMac has been on all day. Here are the steps we did:
1. Attach a USB mouse.
2. In System Preferences, go to Bluetooth Preferences and turn Bluetooth OFF.
3. In Finder, go to Macintosh HD>Library>Preferences and delete the file named: com.apple.Bluetooth.plist
4. Turn OFF the Magic Mouse and/or Trackpad
5. Shut down the computer.
6. Unplug the power cord from the computer and wait a least 10 seconds.
7. Turn ON the Magic Mouse and/or Trackpad.
7. Plug in the power cord and start up the machine. The Magic Mouse and/or Trackpad should automatically pair as a new connection.
This is all we did and it seems to be working like new again. You should know that I use the Apple USB Keyboard (not their Bluetooth Keyboard) so it wasn't an issue when I turned off the Bluetooth. You may need a USB Keyboard to do this as well.
Hope this helps. I know how frustrating it is to deal with this issue.

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