Question "Click" sound when connecting 24 pin.

Jun 26, 2019
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Hello!

Power supply "be quiet! System Power 9 500W"
Motherboard "Asus p8z77-v lk"

When connecting the 24 pin connector to the motherboard there was no click sound. From the third time there was no click sound either.

Is this normal? Must there be a click sound or not?
https://ibb.co/x1cKBJd
Thanks!