Mouse went dead on iMac

When trying to unplug speakers and moving the 21" monitor around, my mouse weny dead and I am getting all sorts odd messages trying to find either a track pad or a wifi mouse. What do you think happened?
1.Could the keyboard have become disconnected from the monitor?
2.I was trying to disconnect the speakers but just unplugged them from the speaker end. Is that enough to get the internal speakers to work, or do the plugs have to be out of the monitor?

OK, got it.
1. Test your USB ports with another mouse or other USB device.
2. Test your mouse with another computer.
Then if you find that the iMac's USB ports are not working, reset the iMac's SMC as per > Resetting the System Management Controller except wait for 5 minutes in step 3 instead of 15 seconds.
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds. 5 minutes.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.

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