I have an electric golf cart, E-Z-GO TXT PDS 2002 and due to my inexperience, I messed up the cart. I put the direction switch in reverse and then hit the forward switch while still moving in reverse, and then heard a beep and the cart shut down. It will not go forward or in reverse. The batteries are ok. What did I mess up and any idea on the cost to repair? ! It was working fine until I got a little impatient. Thanks for any input!