ATC Controller

So the problem started two years ago, where my ATC would suddenly go out. The blower then would blow out hot air from the defroster, but a couple hits against the unit would normally put it back on. Until one day it died for good, and since I did not have the money at the time I just took the blower's fuse out. I finally bought a new ATC unit and plugged it in, but now I am getting no display. It lights up, but is unresponsive when I push any button. Help is greatly appreciated!