Trackpad & keyboard stopped working!

I replaced the battery a few days ago because the old one had about had it. After replacing the battery, the trackpad and keyboard did not work. New battery was killer good. I replaced the trackpad cable. Still no go on either trackpad or keyboard. I replaced the touchpad unit. Still no go. I am using another keyboard and a mouse to make the laptop work but it is awkward. Any idea what else might be wrong in there with all the obvious stuff replaced and battery working fine?