need jeep help

[dstifel]

Alright guys the lady friend is looking at a 03 liberty about 150xxx on it has the 3.7 L. I told her to many miles but you know how arguing goes and it's her money. Anyway it will not crank has good battery and new starter. Now I haven't looked at it yet but what could it be so when I do I know what to look for:try. Any help will get me some serious brownie points and you know how hard those can be to acquire. Thanks guys