troubleshooting Question

Do PSU's & Motherboards go bad together?

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dgrrrFlag for United States of America asked on
Components
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A P4 XP machine won't start. No beeping. No fans turn. There's a faint dull hum from the ATX P4 PSU when you plug it in. Something was rattling around in the PSU -- a transistor (those cylnder things) was disconnected. Plus there was dark brown goo stuff all over, but it looks like that might be a kind of adhesive to keep stuff together.

So I swapped in my good dell ATX P4 PSU into the non-starting PC.  Now the CPU fan in the non-starting PC came on, but nothing else that I can see.

NOTE -- no one opened this PC between the time it stopped working (loaded windows) and the time when I opened it to swap PSUs -- so I doubt jumpers are the issue.

I don't see any scorching / burn marks by the P1 or P4 cpu power connectors on the Mobo.

(1) Am I premature to declare "bad psu AND motherboard"?  

(2) How often do the PSU & Motherboard go bad (become damaged) together?

(3) Do PSU's often have amber or brown-colored drippy-looking gloops of dried "adhesive" strung around the interior to  hold together the transistors & what-not?

Thanks!
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