No idea. Continue to the next bit.

https://www.dell.com/support/kbdoc/en-us/000125179/how-to-run-a-power-supply-unit-self-test-on-a-dell-desktop-or-all-in-one-computer

If that passes, it’s the power button (unlikely, it’s just a button) or the motherboard or some component. If the power button contacts are exposed, and assuming it’s a regular momentary contact switch, you should be able to bridge them to complete the power button circuit, eliminating the button itself.

ect

*etc., short for et cetera, Latin “and the rest”.

But native speakers do that all the time too. I don’t know how, because nobody ever says “ect” out loud.