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!