Sorry, this question might sounds silly.
Earlier when I first switched on my PC, I noticed a weird sound, something like brrr.. brrr.. brrr.. and I noticed that it comes from the PSU fan. When I touched the PSU case, it seems to vibrate a little when the fan was making the weird sound.
At that time, the PSU fan was moving very slowly, something like 20rpm? Actually I am not sure if it's supposed to be moving slowly, I have never monitored the PSU fan before, I only checked it earlier when it had the weird sound (also because of the weird sound).
So I carefully removed the PSU, and opened up to check the fan, nothing is blocking the fan so not sure what's wrong, then assembled the PSU back to its position and switched on the PC again. This time, the fan is still moving slowly, but no weird sound. After about 5-10 minutes, the fan is starting to pick up on speed, not too speedy but slightly faster than before.
Spec - Cooler Master: Extreme 2 625
My concern is,
1. Is this normal? Because I have never monitored the PSU fan before, I have no idea what's the normal speed for PSU fan.
2. If this is not normal, is my PSU dying? I have no problem with PSU at the moment, at least PC is not shutting off on its own. I mean I can still use the PC. Power is running. No issues with other fans.
3. Or is it just the fan problem?
4. If it's just fan problem, is there any solution that does not require changing PSU?
Thank you for your assistance. I am really worried about this because the PSU costs me a huge fortune.
Attached is a copy of the user's manual spec.