Can power cables make noises?
Reason i ask is being getting this high pitch buzzing noise (had one in the CPU fan but that was fixed by swapping it) from the PSU. Or i thought it was from the PSU, but i noticed if i moved the power cord slightly it stopped. So found a spare one and replaced it, and so far its not done it. Not sure why it would make the noise, but it does appear it was coming from the cable and not the fan