You don't need to do a starter with dry yeast. There's more than enough active yeast (more than even liquid) in a pack of dry to ferment nicely. If you just want to wake them up, pitch a pack of dry to 2 cups of room temp water with a teaspoon of sugar and cover it for and hour then pitch to your beer. Keep everything sanitary, of course. The carbonation won't hurt the yeast. What probably happened is that your yeast in the primary crapped out early due to the low temp.
Also; what temp are you serving your beer? What was the recipe? How old were the hops? Leaf or pellet?