My HomePod mini is not responding and when I connect it to my Mac, an orange light just flashes.

See Identify status lights on HomePod - Apple Support. See also the press top of Homepod to reset it steps from Reset HomePod - Apple Support.

tt2

Identify status lights on HomePod says about an Orange flashing light

HomePod mini is updating software while connected to a Mac, or is plugged into a power adaptor that didn’t come with HomePod mini and isn’t rated 20W (9V ⎓ 2.22A).