I can click the track pad and hear the click, etc. And the cursor works fine. But the laptop won't register or recognize any of my clicks..... For the time being, I changed my track pad setting to "tap to click" and that works, but why won't the laptop recognize my clicks? I need to drag click and stuff. HELP!!

It won't register or recognize any of the physical clicks I make on the track pad.... When I changed the setting to "tap to click" with my usb mouse, it lets me gently tap on the track pad without physically clicking; it works then. I don't know how else to explain it. I don't know what's wrong with it. I was told to restart, which I did. And then to hold down option, command, p and r. All that didn't work.