No sound from MacBook headphone jack until the cable is plugged in and -out

Hey there! If I connect speakers (iPod Hi-Fi) to my shut down MacBook and then start the MacBook, there's no sound neither form the MacBook nor from the speakers.
If I plug out the cable the sound comes from the MacBook as usual, if I plug it in again the Hi-Fi works regularly. How come?

Hi,
The HDMI sound may disable the other sound therefore you need to disable HDMI sound (remember put back if you wish to use it). Please check this video:
   http://www.youtube.com/watch?v=LlYXiTK05nM
For example, in my machine I can just disable HDMI sound from this area:
Regards.
BH
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