Why does the fan make jerky noises?

Question

Cooling systems

Recently, the fan on the computer has become increasingly noisy. Now, when you turn it on, it makes jerky noise, as if the fan is getting harder to turn. What to do in this case? 2 years of warranty has not yet passed on the system unit, you can not open it.

Answer 1

wait until it smokes in jerks
, well, so - bearing wear, or the reobas strains it gives waves, I had one from Chinese comrades

Answer 2

I have a branded computer. HP 420
Usually sounds like this:
1 second after turning on YYYYYU
2 seconds 0
3 - and then 0
Launching superPI YYYYU. YUYUYU. YUYUYU. YYYYYYYY

Answer 3

If there is a guarantee, what is the reason for the appeal?

Answer 4

Why does the fan make jerky noises?

- a dying bearing sometimes self-centers and does not make noise, then it loses alignment, etc.

2 years of warranty has not yet passed on the system unit, you can not open it.

- a strange requirement, I opened my Lenovo on the very first day and added fans, there were no seals))