Ok so the other day after the power was cut in cape town i and i was sure the power was back finally, i switched on my plugs and everthing but while my pc was still off i heard a slight hum/buzzing sound. More like a electronic noise so i was wondering, should we be able to hear noise ? Its kinda like a high pitched noise comming from my d-link 504t router. Anyone notice something similar ?or is it just me/as in there may be something wrong with mine ?