A way to sort out bzzing imacs when put to sleep

[SnowOwl]

Hello,

I have recently bought a new i7 27" imac and when the imac goes to slep it seems to crackle/buzz very very faintly.

I phoned apple who told me to do the following:

Turn off the imac.
Hold down ALT, CMD, and R, and then hold the power button.
Then still holding ALT, CMD, and R press the P key.

Can anyone tell me if this is likely to do anything and what it actually does?

Will it mess anything else up?

Thanks.

 

[SnowOwl]

Anyone?

 

[wctaiwan]

It resets your PRAM.

 

[Felias]

Thats the standard answer from support to many things. Should be safe so far, otherwise they would not suggest it...

If the buzzing is hearable when going to sleep, you also have it (in a more quiet way) when reducing the brightness, as it is the same issue...