hi all, I have myself an iMac G4 and i just got a set of apple pro speakers to go along with it since the internal speaker doesn't seem to work. But i can't get then to plug in properly, they just pop pop pop when they are half plugged in. But when half plugged in the internal speaker started to do the same thing. i tried a little force and now nothing pops but it plugs in a little more. Any idea what could be wrong? i can't see anything stuck inside?