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Eww... well, I'll resist saying anything about the iMac... maybe it just doesn't like it.
Though to be serious for a moment, we'll need some more information. Like what OS you're running, CPU speed, RAM, etc. And what game(s) have you tried playing?
When you're going fullscreen, are you actually hitting Alt+Enter/Return, and not simply maximizing it? If you're running some MacOS with Wine or something similar, I haven't heard of compatibility being that good.
You might want to update your graphics drivers, though I highly doubt the problem would be with them. And the picture will take up however much space the game being played tells it to take. There will almost always be side bars or top/bottom bars though. Stretching it to fill the whole screen isn't an option at this point, at least not in fullscreen.
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