MacBook Pro (the newest one.); doesn't have anything plugged in, only built-in stuff like iSight; it is running on battery, however I have always been using EyeTV on battery and it is still working on my left USB port anyway.
The problem is that the way my TV and other stuff are positioned that it isn't very good to use the left USB port, the right USB port is much better in terms of position to the TV set and it always worked...