I use a Pyramid power supply. PS35G to be exact. Sometimes when I turn it on it makes a thudding sound. But it works fine and it doesnt do it all the time. I am not the original owner and Ive had it for a couple years so I know its getting pretty old by now. Wondering what would make that noise. Kinda sounds like someone hit a metal box with a mallet best I can describe it.
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