Sorry for the late reply, I was out of town (turned 50!).
This is the number one question for gardeners in our area, and I've got at least three hydrangeas that didn't bloom this year.
First thing, don't prune them, for most varieties that means taking off next year's blooms. Only cut back the brown stems in June, when you're sure they are dead.
What's probably happening is that the buds are freezing out over the winter. The only solution for that is to surround the sides of the plant with some protection like burlap.
If you put anymore hydrangeas in go for something like 'Endless Summer.' It's one of the varieties that blooms on new and old wood, much more reliable bloomer.
Thanks for watching the videos, I'm having fun doing them. This week is a long one on planting bulbs.