27'' iMac making sound like bongos drumming

f`or lack of a better description my 27'' iMac is making a sound like someone is constantly drumming on bongos.  It will stop for a few seconds and then start up again until I restart the computer. What is this.

A suggestion across more than a few discussions, says to replace the keyboard.
If a keyface is stuck down, or the switch faulty inside the keyboard, the audio
sound usually associated with that function (with sounds on) is what you hear.
You could try making a new user account and test for this odd sound there.
If it still exists after a time of use, the keyboard may be OK. Still you may
have to contact Apple Store and set an appointment with a Genius about it.
{However those with a background in strange movies have another opinion...
it's jumanji: we've wondered where it would turn up next.}
Anyway, you could see if your Mac & k/b is still under warranty; or take it to an
Apple Store genius bar (with appointment) and ask they check it for you.
Good luck & happy computing!

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