The noise is not coming from the fan because i can hear it and when i have the pc off but i have the power cable on the psu.I have a Cooler Master Masterwatt lite 500W 230V for 1 year and the problem has started 3 months ago.But if i have the pc shutted down for at least 8 hours the noise stops but after a 3 hour use of the pc,its starts again.If you want audio of the sound let me know.
*Sound:
View: https://youtu.be/g2r-N_J2ytY
*Sound:
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