A question for somebody who have an in-depth understanding of a startup chime. I don't remember my MacBook5,1 ever had a chime, it just squeaks. Everything is working great, so I am guessing the absence of a chime is not a fault in itself. So the question is: what makes the chime possible? A code in the firmware? Some excitation voltage applied to a particular pin on some chip?
P.S. Of course I tried NVRAM and SMC reset and some terminal commands, made sure that the system volume is at max before turning the machine on but nothing seems to help.
Edit: The NVRAM reset seems to fix it but I let the buttons CMD+OPTION+P+R go only after machine restarted 4-5 times.
Edit2: Apparently my right speaker was torn which did not help in producing a clear startup chime sound. Fixed the speaker with the rubber filling compound - got much better and clear sound.
P.S. Of course I tried NVRAM and SMC reset and some terminal commands, made sure that the system volume is at max before turning the machine on but nothing seems to help.
Edit: The NVRAM reset seems to fix it but I let the buttons CMD+OPTION+P+R go only after machine restarted 4-5 times.
Edit2: Apparently my right speaker was torn which did not help in producing a clear startup chime sound. Fixed the speaker with the rubber filling compound - got much better and clear sound.
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