power supply making noise

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Hi all.

I've bought a new 400 W power suply. It was supposed to be a silence power
suply. In fact, it is less noisy than my old one, but when I turn on the
compueter it makes a lot of noise... It's not a regular noise, like the
noise of a fan. It's some kind of tickling sound... In 3 / 4 minutes it goes
lower untill it gets the normal level of noise of the power supply.
Sometimes the noise disappears when I lift a bit the case and let it down
again, or if I shake a bit the case...
Extrange thing is that I had exactly the same problem with my OLD power
supply... (high sound when switching on).

It that normal?? perhaps it sounds untill it warm up or something??

Sorry for my broken English.

OFFTOPIC Re: power supply making noise

OPS! This post was for the hardware newsgroup...
Please excuse me, I'm sorry.

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