10 cup cuisnart stainless steel & black coffee maker

The beep indicates numerous things. If the top lid is open, it will beep, if you try to depress the brew or timer buttons.There is a button next to the grinder unit, that gets depressed when you close the lid. Check the lid to make sure the tab on the lid hasn't broken. The beep also indicates that brew cycle has finished, although, that is supposed to be only 5 beeps.

I cleaned my coffee maker and forgot to put the cover back on the grinder, so the solution above helped me figure out that there was something missing that sits on the button. I found the grinder cover (clear plastic) and close the unit and the beeping stopped.