They might have a rope or something similar wrapped around them. Have someone else check for you, so that the motor doesn't turn after you unwind (chop off your fingers). The engine might have quit. You need to get the blades sharpened every year anyway, so why not have the mower serviced? Here, it is only about a $20.00 job. They can evaluate the condition for you.
By Harry (Guest Post)
06/19/2008
Well, the blades turn on pulleys and belts. So I would check to see if a belt is broken or has come off the pulley.