Grinding sound when camera is turned on

Power is fine, your case sounds like a jam or an obstruction by a foreign object in the lens (lodged between the extension barrels of the lens. This is an extreme situation and you need professional help, unless you are good at fixing things yourself.

It's the zoom mechanism. You either have dirt / sand trapped in there or the gears have broken.

The grinding noise is the zoom head trying to match the focal length of your lens. A brand new one should NOT grind. It should be silent. It sounds like you got the one that fell off the pallet during shipping. Exchange it for another one.

yes dust in mechanism or broken gear but ti not easy

in any case where the lens makes a grinding noise, something is in the channel and causing the lens to not extend all the way... you will need to send to a repair shop

sb-600/800 make a distinct motor-spinning noise when zooming, this is normal. Any grinding/clicking noises are not normal.

There is no way either of you or a tech can fix this problem without taking the camera apart. Sounds to me like the worm or drive gear is stripped or displaced...probably a 10 cent part...unless you have the ability to do this type of work...its best left to the techs.

There is a risky thing to do...and that is...perhaps its just "jumped" the gear...so it grinds when it attempts to move either in or out....you may be able to manually turn the lens and "click" it back into place. Gently turn it all the way right...then all the way left.
I would want to look inside first before I do anything else...it may be an easy fix...taking it apart will be the not so easy thing.

You could try the Casio Tech Support team, but if as you suspet it is a matter of dirt- there is nothing to be done except replace the camera- the cost os shippin and examining the camera etc. will come close to its replacement.

i think that you have the full-time auto focus on.
go into the menu and turn it of and all should be fine.
seekreep from Edinburgh - Scotland.

A stuck pixel on the LCD is quite common. I have one on my 2020z; lot of people here would tell you the same thing. Long as it's just one, I wouldn't bother trying to get new camera. Far as the lens extension sound: It is a little loud, but a *grinding noise* doesn't sound normal. Go to a store and pick up another one, see if it makes the same sound. If not, you may have a bad camera.