If it's buzzing it's not going to be the PSU fuse. It's most likely a blown capacitor on the board somewhere. You'll should be able to see it, just look for scorch marks or a capacitor with a puffed up top.
Also, don't do anything unless you have a VERY good idea of what you are doing.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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