We have a 2007 Uplander and when we went out to grocery shop today, the doors would not unlock so we unlocked with the key on the drivers door and tried to press the "unlock all" button and nothing. When we tried to start the van nothing happened, no click nothing! Do we have to get a tow? We were looking at buying a new vehicle this fall but may not be able to us this is too expensive if a fix

 

I would check your connections at the battery, and have the battery tested.
Sounds like a loose or corroded terminal, to me.