Seems so, but you may do jumper test if you do not have mother board.
https://www.howtogeek.com/172933/how-can-i-test-my-computers-power-supply/
nostr:npub1cump47edqmkqpcrg3ce7vkhwydjmu66364tzu9tlch0texn0llfsx7u84w
Do psu's need to be connected to motherboard to turn on?
I wanted to test the new one that came in mail. Other parts didnt arrive yet.
No rgb lights or fan activity
Seems so, but you may do jumper test if you do not have mother board.
https://www.howtogeek.com/172933/how-can-i-test-my-computers-power-supply/
Ty