DIYbanter - View Single Post - High pitch noise from PSU

Eeyore

wrote:

I have a new PC and it comes with a high pitch noise ! but it does
not occur all the time.
When I power up, I get the noise (more often than not). But if I reset
the PC a few times, it will go away. But sometimes, when I power up,
I don't get the noise.
So it's not permanent.

Would like to hear from you what could be wrong ? Thanks.

Quite likely to be the ferrite cores in the PSU 'singing' as a result of
magnetostriction.

Graham