Making a bonging sound at start up

As of yesterday morning when starting up my iMac it highlights the HD drive and then makes this random bonging sound like a repeating drum sound. I press the escape button and that does the trick. Then I can be using the computer for a while and then it suddenly starts again.
Does anyone have a clue?
Thanks
Chris

try if _*resetting the System Management Controller SMC*_ helps.
JGG

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