Booster pump won't start up...what to check?

[JimK]

I'm pretty sure CarlD meant bonding screw.
My pump is powered through a twist-lock receptacle and plug on a circuit with GFCI installed just for it.

Thanks. Is the plug outside exposed to the weather or inside?

So what's a bonding screw?

Looked up in Google and it seems to be a screw used used in a electrical panel for grounding? Not sure how this relates to being able to easily remove a pool pump for winter storage.