MacBook mouse pointer lockup
I had a problem similar to this and it was because of a bluetooth mouse which had been left switched on in a bag. The button was held down by something resting on it and it was overriding the trackpad. If you use the keyboard shortcut (usually cmd+spacebar) to bring up spotlight and type bluetooth you can use the down arrow key to select the bluetooth system preference and you will be able to see if there is a connected mouse there causing the problem.