I Mac trackpad not working, batteries changed...

I Mac trackpad nt working even tho batteries changed...

I suspect the trackpad needs replacing, is it not working at all?
Do you have a USB Mouse to test with?

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    Note: I decided to try exiting the Diagnostic Self Test app to see if the TrackPad would stop working... or if using a specific app made it stop working... and after doing so, then rebooting etc. the TrackPad has now been working for many hours: dare I try to reinstall some of the apps I removed?

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