(Mountain Lion) suddenly the screen turns black, and I have to use the switch to turn it on. And, the screen turns to zoom, and the only way to turn to normal is to close the window and start all over again?

(Mountain Lion) suddenly the screen turns black, and I have to use the on/off switch to turn it on. And, the screen turns to zoom, and the only way to return to normal is to close the window and start all over again?

Does the screen go black while you are using the machine? ...or after it has sat idle for a bit?
If it happens while you're using the machine, check to see if a hot corner has been set for sleep. You can do that here: System Preferences > Desktop & Screen Saver > Screen Saver and click the button labelled "Hot Corners..." in the lower right.
If it happens after a bit of idle time, that's normal sleep behavior. The delay can be adjusyed here: System Preferences > Energy Saver.
In either case, pressing any key on the keyboard should bring it out of sleep.
Re zooming -
If this happens while in Safari, and you are using an Apple Magic Mouse, a default setting applicable to it is that a soft double-tap on the mouse will zoom the Safari window. A second double-tap will bring it back.
If it is the entire screen that is zooming, Control plus scroll gesture on the mouse will zoom the whole screen. Repeat with the opposite scroll gesture to bring it back.

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