The anti-cheat switch should be normally closed. Clean it, and pinch it so that it makes good contact. For home use, you can jumper it out. My money was on that switch all along. I've had a few games where this was the culprit.

You can use an emery board in a pinch, but after using it, run a strip of business card-like paper through the points while holding a little pressure on the switch. If you have nothing abrasive, just running the business card strip through the switch several times may do the trick.
The Pinball Resource sells a contact cleaning strip called a Flex Stone. If you place an order there for parts, be sure to get a couple of these.

The screws should be snug already, but that's not how the contacts are adjusted. As was said above, just jumper out that switch if it appears to be open.

Does this game have a ball count unit? Could be that it's stuck, and can't home. Can you see a balls to play number on the backglass?

There are several switches that will run the motor when closed. Refer to the schematic and try to narrow it down.
If you don't have one, get one from Pinball Resource.

Anything lit for "add bonus" will pop up a red ball in the backbox. They count out individually at the end of each ball, unlike "Bowling Queen" et. al. which accumulate the balls during the entire game and dump them at the start of the next game.

This is very important, and often overlooked. It should be one of the first things you do after first popping the hood on an old game. Otherwise, any switch adjustments won't stay put, and you'll keep chasing one problem after another.