My right speaker sounds like blown only at the startup sound

I was recently cleaning up my macbook pro 15inch Intel Core 2 duo 2,4 Model macbookPro 5,1 and used onyx. After onyx finished its work it restarted the macbook and the right speaker sounded like blown. I played some music but the speaker was playing clear. I formatted the macbook and installed the same OS x but still the blown sound on startup remained. I upgraded to mountain lion but still the speakers sounds like blown only when computer starts up. I have cleanded the PRAM, PMU, fixed disk permissions but still is not going away. I am pretty sure is a problem of the software or something that onyx did to the system but have no idea what it is. anyone has an idea or something?
Thank you all for taking the time to read this.

This may explain the phenomenon you are experiencing:
http://support.apple.com/kb/TS3336
If you are still concerned, make an appointment at an Apple store genius bar and have it inspected.
Ciao.

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