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I've had this psu for around 4-5 months, I noticed a few days ago when I turned it on that there was a high pitched whistleing/hissing sound coming from the unit. It rarely lets up until last night when It wasn't as bad as usual. But i'm a little concerned the unit is going to go pooof! 
Has anyone got any insight into this problem ?
Thx.
Has anyone got any insight into this problem ?
Thx.