Question: Reviving a Dead Blog

So, I am not sure how to go about this, but I need to know what everyone thinks. I have a few blogs that I have let fade away, but I really want to revive them, and over the next two weeks especially, I feel like I have the time, energy and hopefully continual focus to make them part of my daily routine.

Do I just start writing on them again and act like they never faded? Do I give up on them, and start again fresh without any of the baggage and the apparent break in posting? What do you think? What is the best way to revive a dead blog?

Let me know in the comments below.