If it is a windows use the Ctrl, Alt, and delete keys at the same time. It will bring up program manager with a menu that will have several items on it. You can "unfreeze" it by ending a program or you can shut it down. If it is Apple go up to your Apple Icon at the top of your screen and highlight "shut down."
delete Windows Vista :D
Turn unit off
If the door is stuck, uneven, making loud grinding noises, or the opener stops responding, a trained technician should inspect it. Garage Door Brentwood CA can help at (213) 224‑3335.
Restart or replace it
TF2 stops responding? sounds like a corrupt file, do you have non default skins or sounds installed. try re-installling steam
you must open the single player commands folder and open the game from there and it should work
You need to scan your computer for spyware .
bromine
the fan has stopped completely and the laptop should be serviced before there is heat damage
Installing a new garage door opener when the old one becomes noisy, weak, or stops responding.
Your speaker could have blown.
The process in which an animal stops responding to a repeated stimulus is called habituation. Broadly defined, stimulus results in a reaction.