No wifi no sound of yosemite

hi,
  i've updated my mac mini to OS X 10.10, but when the update was done, strange thins happened: no wifi no sound even after several times of restarting my mac mini .
    now i have to connect to internet by cable, which is absolutely uncomfortable.
can u pls help that ?
thanks

BTW, i have a sounder connected to mac by bluetooth, the connection is ok but sound is missing because i can't even adjust the volume.

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