My PC is making loud sound when I start it

[John4321]

As soon as I turn the power switch on of my system, it makes a loud sound nonstop for 5 mins and then it stops. My Technician came and he couldn't understand y. So he removed each hard disc and check but that wasn't the problem. I will soon be posting the sound by recording it tonight. Please let me know guys what could be the problem

 

[mithun]

One of your fans may be. With the onset of the winter it's rather common for the bearing lubrication to dry out and cause such noise.

 

[jsmithe]

^ Second that. Most likely the bearing on the case fans or CPU fans. Carefully lift up the sticker on the center of the fan and add just a drop of machine oil. See http://www.techrepublic.com/article/quiet-noisy-computer-fans-with-a-drop-of-oil/

 

[Being.smart]

smps is kaput, throw it buy new one