Get a socket and extention on the frt crank pulley. Crank the engine over by hand, if it turns and locks, reverse the rotation. when you start to turn it back watch the crank pulley, see how far it rotates backward. If it stops just before turning a complete revolution, you have something in the cyl that is contacting the piston, keeping it from turning over. First guess would be a valve. H22 have a problem with the hydraulic tensioner. sometimes they let go creating a slapping or knocking noise behind the front cover, the timing belt is loose as a result. Engine jumps time, and you bend valves. I hope it isn't the case. but all isn't lost, it can be fixed in a day by the right person.