no that isnt what causes the whine.
while its doing it, have u tried opening another tap n another room 2 c if that makes it stop.
i blv i know WHY it whines, cant think of it at the moment, but im pretty sure it has something 2 do with the water pressure.
ill try 2 remember/find out & come back, but try turning on that other tap & let me know what happens.
ADDED
ok. it wasnt pressure as such. its air n the pipes. below is a forum that addresses ur prob...
added another. read all the answers. the 3rd has 3 additional links. if u dont find a solution there, im afraid its the plumber 4 u! ouch!! (-: