Outputting +5v all the time!?

The output pins of my Uno are outputting +5v in the both of the following cases. 1. The pin is not defined in the IDE. 2. The pin is defined as an output and set to low. I see no visible damage on the board. Is the AtMega fried?

Could be. All pins, or only some? Does the chip feel hot at all? That's usually a good sign something was damaged.