It's usually about the weather.
1, the fan lubricant winter froze, had to boot for a while the temperature rise will be normal.
2, the computer boot, the fan ring may be the cause of the fan bearing wear, and a good fan to try, may be good, the power supply fan to a few months to add oil, preferably automotive oil, there is ash!
3, the trademark above the fan, tear it open, you will see a small eye, the engine oil with a screwdriver point then one or two drops on the line, should not be poured more carefully, the fan burned ~ ~ ~
4, the main source of noise is the CPU fan, power supply fan, chassis fan, video card fan, removed after each refueling (sewing machine oil Can) fans have a sticker on the back, opened after the oil can be injected, not too much.
In addition, the chassis should be placed in a stable ventilated place.
5, if you open the cover of the case will not ring. The machine resonates. You can choose to relax the screws of the fixed chassis cover without ringing.
6, if it is the direction of the power to send. Can clear the Earth. If it is still ringing, it may be the power failure of the electrical performance. There is a warranty can be done warranty, no warranty can go to repair.
7, if it is the CPU direction issued. Try to hold the fan with your fingers (be careful not to be hurt, and be sure to let go in about 5 seconds). AMD's CPUs are easy to burn. The reason for the CPU fan is not to ring. Try to clean the soil. Sometimes the reason for CMOS settings. Restore the factory settings on the line.