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.
And there is a funny thing too.
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!
internal speakers: sounds yes / voice no
external speakers: sounds yes / voice yes
Do you think the hiss problem is related with this "missing voice" issue?
Have you experienced something similar?
Do you think i should bring my macbook to assistance?
Thank you (and sorry for my english, i hope you can understand me anyway)

i have the same problem: ipad2 makes noise every time when plays sound (music, video, games, typing)
i'm sure that problem is hardware..
the noise exists only with speaker: if i connect headphones noise disappears

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