If the MB never chirps the on-board noisemaker/speaker if it has one, it is likely the MB or CPU, most likely the MB.
CMOS reset is a good thing to try, but not too hopeful.
I may have a LED gizmo that does voltage testing of PSs somewhere. I have no idea where though and it may only have the main 20 pin? connector, not the +4 or ++4...
What CPU/MB?
Pull the video card, it should startup the CPU, RAM and MB without it and stay running.
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I am a Commodore PET --- Now get off my lawn you kids...
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