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As you've fitted a new starter we could 99% assume that the solenoid and motor aren't faulty. There's only a couple of other things I can suggest that would give your problem. Either some sort of fault with the flywheel thus "jamming onto" the starter dog, or your solenoid is remaining live after the engine has started.
Check the solenoid feed wire (the small one, not the large heavy cable) to make sure you don't have 12 volts at it with the engine running - you should only have voltage there while the engine is turning over. If it has voltage with engine running then the solenoid will be permanently extended and therefore against the flywheel.
As these cars "auto start" with just a press of the start button (rather than having to hold the button in), then your problem could be that it doesn't "know" it is running. There's a sensor at the gearbox which tells the car whether it's in gear or not, and if it thinks it's in gear then you need to hold the start button in until it starts. By disconnecting this sensor perhaps it will over-rule the fact that it doesn't know it has started, and therefore prove that it's wiring rather than your starter/flywheel etc at fault. (btw the sensor also controls the reversing lights, so they won't work with it unplugged).
Currently in mister_cee333's garage:
Toyota Avensis 1.8. Formerly Jaguar X Type Sport d 2005. Formerly 2001 Laguna 2 1.9 dCi