I got my MacBook Pro out and was looking at a few websites and I realised that my trackpad was no longer ‘clicking’.
The tap to click was working fine, but the click had stopped working.
It was a bit disconcerting, but the MacBook was still usable.
I thought was my trackpad broken.
However…
When I did a restart I couldn’t click on my name to log into the MacBook Pro as tap to click didn’t work on the user login screen.
I had to get a mouse out to log in.
I did wonder if I would need to get it fixed, but first I did a Google search.
One possible resolution was to reset the SMC.
The system management controller (SMC) controls how a Mac manages power.
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- Shut down your Mac.
- On your built-in keyboard, press and hold all of these keys:
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Shift 
on the left side of your keyboard
Control 
on the left side of your keyboard
Option (Alt) 
on the left side of your keyboard
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- While holding all three keys, press and hold the power button as well.
- Keep holding all four keys for 10 seconds.
- Release all keys, then press the power button to turn on your Mac.
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I did this and I was pleasantly surprised to find that the trackpad was working again.