多项选择题

A customer reports that their sound is not working. They state that the speakers worked previously. Which of the following should the technician check？（）

A.Speakers are in regulatory compliance.
B.Speakers are on and the mute is off.
C.Ensure the speakers are on the Windows HCL.
D.Verify the system has enough hard drive space.
E.The audio driver is installed correctly.
F.Speakers are plugged into the correct jack.

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