# data[].attributes.body
Check easy control panel, if it's turned on then turn off and trash it.

Open key caps and type; keyboard will darken when keys are pressed.

Check Keyboard connections; Click on insertion point and type

# data[].attributes.body
Keys clicked when pressed and nothing happens, not recognizing keys, typing and nothing happens.

# data[].attributes.body
Close all Apps and restart the computer and try them again.

Apps may not be compatible with the upgrade.

# data[].attributes.body
There may be too much activity for your computer to handle all at once.

# data[].attributes.body
Restart the Mac.

Refresh your screen.

Remove all extensions and restart again.

# data[].attributes.body
may have a startup disk that is extremely low in disk space, therefore it freezes up after starting.

# data[].attributes.body
You may need have too much power stored up

# data[].attributes.body
Check power cords-both of them.

Check power strip.

Check screen brightness.

Check network connectors.

Check keyboard connectors.

Check pins in connectors.