12v Ryobi cordless drill wont work.?

My dad was going to throw out an old ryobi 12v cordless drill but he said if I can fix it I can have it. The drill and batteries work. The charger however wont light up when I plug it in. I took it apart everything looks ok to what I can see. When I put the battery in the charger in it it won't lock in and i... show more My dad was going to throw out an old ryobi 12v cordless drill but he said if I can fix it I can have it. The drill and batteries work. The charger however wont light up when I plug it in. I took it apart everything looks ok to what I can see. When I put the battery in the charger in it it won't lock in and i have to push the thing in it to lock it and Im not sure if the led light just burnt out. Im not sure if anyone and tell me whats wrong it if you has a similar problem or something.
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