Your USB port may be having a power-related problem and resetting the system management controller (SMC) can fix your problem with your keyboard. What you can do is to try replugging them one by one until you find the device that is causing the problem.Ĥ. If you can use your Keyboard now the problem may be with one of the other devices. Now reconnect your keyboard and mouse back into your computer. These can be a mouse, keyboard, printer, etc.
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