Hey everyone. Just since the beginning of this week, my iMac G5 (Rev. B) has been emitting a high pitch sound. It seems to be coming from the lower right hand side of the computer. Anyone else had this issue or have any suggestions on what to do? It better not be a sign of a logic board failure! I can't afford to have it replace and I'm not covered by apple care. I did do an extended hardware test and all came back A-Okay if that helps. Thanks for helping me, in advance!