S20 Workstation off, noise from the speakers

Hello,
I have a ThinkStation S20, and lately from time to time you hear a hiss from the speakers even if the workstation is turned off.
May depend on what?
thanks

are you referring to the internal speaker or do you have external speakers connected?
does the sound go away when the power cable is disconnected from the S20 and capacitors have fully drained?
ThinkStation C20
ThinkPad X1C · X220 · X60T · s30 · 600

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Popping noise from the speakers.

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Maybe its a heat up issue of some sort because while I logged in and typed this it seems to have stopped.
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I have had my MacBook Pro for 3 months now without any negatice issues of any sort. This is the best, most incredable machine I have ever owned. The other day, after installing a bunch of Widgets, .Mac Podcast pack for Garage Band, and other downloads such as custom icon sets and backgrounds, I noticed that a popping sound began to be emitted out of the left side of my MBP. This sound occurs aproxiamtly ever 20 to 30 seconds. I have rebooted, shut down and restarted, and cleared the cache, etc. many times in the last 3 days with no success at quieting the popping sound.
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Hissing noise from the speakers

hi mates,
i hear a hissing sound from the internal speakers whenever the system tries to play sound through the internal speaker, be it a system sound or playing my music, or just by opening a application that may play music, i get this hissing sound before a system sound and this hissing noise continues for some time after the sounds are stopped playing, i get this hissing noise even when i change volume of the speakers. i dont get it through the headphones. the strange thing is i get this hissing noise even if i play a movie when my speakers are muted.
i went through this forum, some members have adviced to reset the pram, smc, reinstall the os, friends i tried all these but still i continue with this problem.
my macbook is brand new and just a week old.
i am really worried about this problem.

hi sailor,
contacted apple phone support, unfortunately apple care number is not free in australia.
first time it took 17min and was not able to contact a technician coz credits in my mobile ran out.
second time it took 25min. i explained all the issues
told them i reset the pram, smc and reinstalled the OS and still i hear the hissing noise.
they replied that speakers may make a hissing noise if the macbook is on battery, but the noise should be very low and it should not be audible, if the noise is audible and loud, they suspect its a hardware failure, i got my case id and will be taking it to the nearest service center here, for them to have a look.
so if u have a macbook that is under warranty dont hesitate to contact them. i guess even refurbished macbooks bought in online store also have a 1yr warranty.
<edited by moderator>

Hiss from the speakers?

Hi everyone. I have this new penryn 15" mbp, and i deeply love it!
But I hear a very high pitched hiss coming from the speakers (i think) whenever i am about to hear some noise from the notebook.
for example when i turn on or off the volume, i hear the volume quack and then the hiss starts, and goes away after about 20 seconds. or when i play some song in itunes, it starts immediately and persists while the song is playing.
if i plug some external speaker jack in the headphones port, the hiss coming from the internal speakers stops immediately and i don't think there is any hiss coming from the external speakers, but it might be because they are not very high quality.
This hiss is very high pitched but the volume pretty low so my mother can't even hear it. But i definitely hear it (and i swear i'm not a dog ) and it gives me such a strong headache that i must plug something in the headphones port to make it stop.
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I used skype perfectly since i received the macbook (one week).
Yesterday, i was using internal speakers, and while i was able to hear every sound, i couldn't hear the caller's voice.
of course i thought it was a caller's problem.. but it wasn't.
When i plugged my external speakers the voice came out!
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external speakers: sounds yes / voice yes
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Have you experienced something similar?
Do you think i should bring my macbook to assistance?
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****Click the (purple thumbs up icon in the lower right corner of a post) to say thanks****
****Please mark Accept As Solution if it solves your problem****
Regards
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http://i1224.photobucket.com/albums/ee374/Diavonex/67a15edf.jpg

S20 Workstation off, noise from the speakers

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