Question Suspiciously slow PSU fan

[ScreperisLT]

Hello. A few days ago I have gotten a bargain on a used electronics website. I bought 6 Corsair PSU's ( Each 17Eur, whereas everywhere else they cost 30-40Eur ). I have just done testing them all and all of them work perfectly, except one. The Corsair CX600M. The fan seems a little too slow. Is it normal or should I return this PSU? Maybe it's some kind of ,,Low temperature - low rpm" mode? I will attach a video. I see it the exact same way as it is seen in the video. By the way, I have noticed that it does ramp up for a split second and only then it slows down. Also, I cannot feel any airflow moving at all.

PSU is in this photo -

https://imgur.com/tPXqV6t

View: https://imgur.com/tPXqV6t


Video of the PSU's slow fan -

https://imgur.com/1mV3oZd

View: https://imgur.com/1mV3oZd

 

[--SID--]

What do you expect from a 12 year old PSU? It's old and worn out after all those years includes the fan.

I have just done testing them all and all of them work perfectly, except one.

You've measured the ripple too?