Recently found that the computer boot with the noise, why?

Users questions: Lately found that the voice of the boot with the normal startup sound after the motor will be about 3,4 seconds and it ~, then the noise disappears, wait a while and then re-starting operation when there is no such a situation, and also opened the case, did not see where the wrong, this and weather it? Friends can know Long time fan but also a little light oil to the axis of Riga (such as sewing machine oil), you open the case, remove the CPU fan, remove the dust, to foil under the shaft, down 1.2 drop in the film posted a good lubricant , installed on OK, then we must replace the fan was not work.
  • This information provided by the users.Thanks!