How to bring potted Hydrangea "back to life"?

I rescued one just like this from my istant's desk several years ago and it is now a big ole bush in my backyard. Here is what I did. Transplant it into another, larger pot with drainage and some decent well composted potting soil. Trim it back, especially where it is dead. Don't worry, it will come back and give it a boost with some organic fertilizer. Mine do like moist soil conditions, so don't neglect it. Give it some time, some real sunlight, be patient and it will come back.