Keyboard - constant bell town coming from iMac

About a month ago, my keyboard was acitng up on my intel Mac. I bought a new one.
htis morning, it firs twouldn't type hte letter "t" at all. I restarted it. Now it lags on it, or types it endlessly and sometimes hte Mac makes hte conitnuous bell sounds.
ANY ideas? Doesn' tmatter which keyboard (I tried 3). For the brand new one, my Mac otld me hte battery was low. But it's one of hte wired, extended Apple keyboards. Could i tbe a conflict wiht my Logitech mouse? It's a tleast 2 or 3 htree years old.
I'm running 10.8.3. Even clicking on "abou thtis Mac" is problematic.

Try doing a SMC Reset 2-3 times and if that doesn't help reset the PRAM twice too. Click Intel iMac SMC and PRAM resets for instructions.

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