[KimMG]

Remove the sparkplugs and belts and try to turn the motor by hand. Make sure all the pulleys can be turned by hand. If you can't turn the motor by hand, then the motor is seized or locked up. Removing the valve covers shouldn't be a big deal. Look to see if a valve dropped and is preventing the motor from turning. If the rings have seized, I would use a penetrating oil like PB Blaster.