Nordic Track NordicTrack C2150 Treadmill "computer work surge" Questions

...computer board. This device may turn on, however; the instructions and sequence of activity will not work. Many reasons for this to happen; and usually the problem is traced back to a power surge. ...

...work...no other function operates...no start/stop, incline anything. I really love this machine and would appreciate any help you could offer. Have replaced motor, walking belt, rollers...everything ...