I still don’t get why you won’t invest in one of those simple outlet testers. You can get some pretty good answers instantly.

I don’t remember why, but I was replacing a projector at a guys house, and I found a wiring fault in the projector outlet with my tester. Told him to get it fixed before I came back with his new projector. He hired an electrician, and found one of the wall outlets had wires reversed, affecting a couple outlets following it.

Those testers are cheap and very useful. Your multimeter is also required for testing but will mostly show faults but not tell what’s wrong.