Keyboard USB keeps disconnecting

I have an iMac 21 "under OS X 10.11.6 and randomly my USB keyboard is disconnected from the system.  It is a standard USB, not a bluetooth keyboard, there is no batteries involved.  If I unplug the keyboard and plug it back, it works again... for a while.

Could be one of the following problems.

The cable is bad.

The keyboard is bad.

It is loose or faulty USB port on the Mac.

Some-other Device USB is a USB bus. iMac overload

I'd do it:

1. try to move the keyboard to the different port at the back of the iMac.

2. then I would test it for a time with only the keyboard and mouse plugged into the Mac.

3. then if it happens again, I'll try another keyboard. (most any generic USB keyboard works)

In addition, you didn't say how old the keyboard is...? Might be worth taking in your Apple Store or FSAA, because Apple keyboards are covered for one year.

Tags: Mac

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