Volvo Repair: A/C and Heat Unit, heat unit, magician

Question
After I replaced the battery the A/C and Heater unit not longer works. Took the Volvo to the dealer and was told that the unit wasnt getting any power I just dont believe that this was cause by just replacing the battery.

Answer
If you told me the year and Model of your car it would help.  Im not a magician.

It was called for because I get tired of people asking me questions in the format you provided.  I have specific instructions on the ask a question page and you didnt follow them.  These cars are not all the same.  If you were offended, I appologize, but you need to put yourself in my position.  Everyday someone expects me to guess what car they have and it gets very frustrating.  If you give me your information, I will be glad to help you.  Roger