The usual rattling of the side cover is eliminated by a rubber gasket, or by correctly bending the mounting slots.
May buzz CD / DVD drives... This may be due to a backlash between the computer case and the device, or to poor fastening. In order to fix it, you need to remove the drive, check the fastening of the so-called clamping antennae. Bend these tendrils and check how tightly the drive is held.
Occasionally, crackling or whistling sounds may make hard drives... In this case, you may need to replace the hard drive. However, mounting the hard drive on rubber mounts can help absorb vibration.
One of the common causes of computer hum can be fan... It's good if you just need to clean it from dust. It's extremely simple. We remove the side cover of the system unit and carefully clean it with a vacuum cleaner to blow it out so as not to touch any wire and circuit. Alternatively, you can remove the fan, it is attached with several bolts, and clean it thoroughly. After that, you need to lift the "label" located in the center of the cooler, and drop a little machine oil there. Sunflower oil for the fan is not advisable.
It is much worse if the fan is out of order. In order to correct the situation, you need to remove the side cover of the system unit, and then press the on / off button. Now you should listen and find out which of the fans hums unpleasantly. Replacing a cooler, in principle, is not difficult, but it is vital, since the normal functioning of the computer largely depends on it.
