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Mac Classic loud hum from PSU when attempting to start

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I will admit it's been about five years since i fired up the ole' classic.


When I tried to last night, there was a disturbing loud humm (electrical sounding) coming from the PSU area.


I opened her up and all the boards are good, no exploded caps or PRAM batteries that I could see.


Of course I don't know much about CRT tubes or PSU's so i left those alone not wanting to electrocute myself.


Has anyone encountered this before?  I do have a local electronics guy who is a wizard with soldering and electronics and has been doing it professionally for 35 years.


If this is something that could be easily fixed I would like to do so before salvaging parts and going the Macquarium route. 



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