Need help, hard drive noise on a brand new Acer Aspire desktop TC 780 Ki3,

I would greatly appreciate any help or input as I have to make the decision if I need to  return the new  computer, something I really did not want to do.

I just have turned on my computer Acer Aspire TC 780 K i3-7100CPU , 1TB hard drive , 7250rpm, Ram 8GB for the first time.

My hard drive ( no, its not the fan) makes this sound upon boot up and continuing of what I perceived to be a muffled rattle, like constant popcorn popping. It is it continual

It would be quite annoying to listen to this all day . I think, it gets a little better when its hibernating, but it does not stop.

• My question is about this hard drive sound .

Has anyone encountered this with an Acer or for that matter with any 1 TB Sata hard drive?

Is this normal?

I hate to sent the computer back to Amazon, thinking its defect, then order the same computer and find out that has the same problem.

I have not even yet really used the Acer computer yet . I just now set it up, and the power is just on now that is all . It still has the low muffled rattle occasionally.

I have had several computers before, including a laptop Acer, none had a noise of the hard drive.

But I also never owned a 1TB hard drive with or 7200RPM .

I have listened to the sounds of failing hard drives on “data cent” .

The knocking sound is the closest to mine also I do have more of a muffled rattle . The last Acer rep said the hard drive ( Essex) on this Acer should have no sound, my computer must be defect.

However, I saw some other posts online of persons owning Acer desktops with a 2 TB drive hearing similar sounds and others agreed they have this as well ( different computer) .

This makes me wonder if its an Acer desktop issue?

Anngret