hey, I actually solved this by opening the laptop. You just unscrew and take the plastic casing out. Then on the right side right below the 2 fans there is some connector (a wide grey one) connecting the hard drive to something else. I think it's the fan slightly touching this that made the noise. So once the laptop was opened, removed a bit of dust from the fans, and slighty changed the position of this wide grey connector by trying to flatten it, and then I reclosed it, and the noise was gone. So not sure exactly what I did that made it go away, but it worked!
Good luck!
