tnole

I have a 2008 silverado. The 3 cigarette lighters aren't working. The 2 on the dash and the one in the storage bin under the center arm rest. The left one on the dash started working once in a while, then all 3 went out. I checked the fuse inside the dash labeled "Accessory Power Outlets", it was good. I checked the fuse under the hood labeled "Cigarette Lighter, Auxiliary Power Outlet", it was good. Am I missing something? I can't imagine all 3 of them going bad at once, considering I bought the truck brand new and have never used the one in the storage area. Thanks for any help.