Moving object inside MacBook: is it a big problem? When I tilt my MacBook, I can hear a moving object inside it (like a screw or grain). It should either be something that belongs inside and for some reason got loose, or something from the outside that entered the MacBook (via the fan?).

I plan to go to an Apple Store to get it repaired, but is it an urgent issue? Could I damage parts inside my computer?
If the object is metal, it has the potential to short circuit something and possibly cause an expensive repair, especially if it shorts the system board. Even if the object is not metal, if it can get in the fan it may have potential to damage it.

I would immediately shutdown the computer and take it to an Apple Store or qualified repair center if you cannot investigate yourself.