Fan powers up but fan blades do not fan

Question

I am wondering if this fan has a reset button somewhere that I don't see. The product powers up but the fans do not fan the air. I have had this fan for about 4 years but have not used it for at least the last year. It has not been dropped and I did shake it to see if I heard any loose parts. Checked the instruction "manual" but there was nothing for troubleshooting. Thanks a bunch...