My sister gave me her 1997 Nissan Quest, which wont start. They had it for a short time, and was running great. Then all of a sudden - it just stopped running. Sometimes it will start and the majority of the time it wont. I need to get this van running ASAP, unfortunately I dont know anything about cars/vans. When I put the key in it, everything comes on. All the lights are lit on the dashboard and windows/radio work. The battery is brand new, I know its not that. It doesnt make any sound at all when I try to start it. Any help is appreciated. Thank you.