Macbook won't register clicks but trackpad working
I have an old white Macbook that is running Lion with latest update. For some reason, it's not registering clicks anymore. This is an old macbook so it has a physical click button. The trackpad works fine. I can move the mouse around but I just cannot click anything. I tried to connect a USB mouse to get around it but it didn't help. The mouse won't work either. It's just weird. I tried to restart but it didn't help. Now I'm stuck on the login screen. Please help! It's driving me crazy :-/
MacBook, Mac OS X (10.7.3)