I have a 2007 Silverado Z71. Recently I have been having some problems and it seems to be getting worse. At random times it will not start. It won't click, won't make any kind of noise at all. All of the lights and radio will come on but it won't even try to start. I've tried to jump it and it does nothing. After a while of sitting it will start just like it did when it was brand new and you would never know anything was wrong. I've taken it to the shop and they've kept it for a day but they called and said they can't get it to do it again so they can't diagnose it. There is no pattern to it. It just does it randomly. Anybody got any ideas? Computer? Electrical? What would you do?

 

Sounds like a loose or corroded connection. Start with checking the battery cables at both ends and go from there.