engine will not rotate

[IHateHacks]

True.

Even with the trans in gear, you will have no problem spinning the crank with a breaker bar. 1st, 2nd, 5th, Reverse, it don't matter. I can actually move my car with it in gear with a breaker bar.

If you can't turn the motor with the starter, you are not going to spin it by hand, I can tell you that much.

We still need more info to even try to guess at whats wrong. Did the motor run up until you took the spark plugs out and threaded the compression tester in? Is that when the motor would not turn? I'm now thinking he dropped something in there like a bolt....