Dell XPS One Power Supply

A few nights ago, my Dell XPS One starting making a loud hissing/ static noise from the top of the computer.  I turned the machine off and now it will not turn back on. After removing the back and thoroughly cleaning the computer, I noticed the noise was coming from the power supply.  Has anyone had this problem and if so is there a solution?  My thought is that I need to replace the power supply, but I would love any input before I do that.  Thanks,

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