What to do if the cooler is buzzing a lot?

Question

Iron

I'm sure that many will write "google" or "look on YouTube", but my situation is a little different.
When you turn on the computer for the first time, the cooler on the back of the system unit (not from the PSU) buzzes very strongly, if you turn off the computer and turn it on, the cooler stops buzzing so much and works perfectly, almost without making noise and vibration.
At first I thought that it was touching something and carefully looked through the cooler, but I did not find anything that could interfere with
it. What causes the cooler to buzz when you first start the computer? (namely buzz and not make noise)

Answer 1

The mechanism is worn out. First you need to try to disassemble and lubricate it. Well, it's best to replace it.

Answer 2

The grease has dried up, the bearing mechanism has worn out, and so on.
At the first start, the cooler cannot spin in a balanced way, and that's why it cracks. Having scrolled and heated up, it nevertheless dilutes the lubricant a little, heats up the bearing a little, and with a slight knock it can enter into even rotation.
The further - the worse it will be for the mechanism, the longer it will buzz and not always enter the normal rotation mode.
If it's a cheap cooler, change
it. If not, try to disassemble it, wipe it from dust (each dirty blade will shift the balance during rotation), change the lubricant. Should feel better for a while. But better to replace.

Answer 3

I join Denis Ineshin and Artem - the bearing (vtklka) in the fan has worn out (gouged).
A temporary solution is to peel off the self-adhesive in the center, put a few drops of oil on the axle, twist and stir so that it leaks, stick the self-adhesive in place. Maybe a week, maybe a month will not buzz.
The permanent solution is to buy a new one and replace it during this time.

Answer 4

As an option
First start (cold start), the motherboard accelerates the fan to 100% and it makes noise, with a subsequent reboot it no longer accelerates like that.
+ try to put it not on screws, but on rubber latches.

Answer 5

You have a production of a sliding bearing, in the common people of a bushing.
Why did this happen - did you ever lubricate it, service it?
The solution is to change the fan.
Not a solution - lubricate.

Answer 6

I can not understand one thing: Why does it only buzz when you turn on the computer for the first time? i.e. if I turn it off at night and turn it on in the morning, then it buzzes, and if I turn it off and turn it on after 2 hours, then it does not buzz at startup.
Removed the fan, lubricated tomorrow we will check C: