Administrator 
During the past month some annoying noises began emerging from my pc
...
After carefully eliminating the source of the noise i concluded it camefrom the power supply unit fan.
After getting the power cord out of the Psu and pressing the power buttonsteadily for a few seconds to release any excess charges remaininginside the capacitors, i screwed out the 4 screws that hold thePsuto the case.
Afterthat i did the following:
- screwedout another 4 screws that hold the Psu unit together
- screwed 4 screws that hold the grill fan protector
- carefullycleaned the blades of the fan usingA damp cloth
- removedthe round sticker on the fan's center
- revealedthe fan's core by removing a round rubber protector
- useda regular engine oil to lubricate the shaft
- sprayedWD40 inside the fan's core (not where i used engine oil)
At the end of the process the fan was just like new and performed perfectly and of course – silently
