Machine won't sew. 5 year old machine. No problems until this week when it simply will not sew--I

Question

5 year old machine. No problems until this week when it simply will not sew--I press the pedal and nothing. the wheel at the side will turn at first and then too tight. I unplugged, opened up and cleared all dust, etc. It's similar to the no lights, now sew posting except the lights are still on and I can thread a bobbin. No problems with cords. All connections look fine.