Hi there and welcome
Sorry to hear about this problem.
Can you remove the batteries and then hold the shutter down for 60 seconds then release.
Then put the batteries back in, turn it on and tell me if it then starts please.
ok, this can be something in the gearing that is jamming it.
Turn it upside down and put it on something that vibrates, eg an Electric Razor
Then turn it on and off a few times to try to get anything dislodged that is jamming it.
Let me know the results please