The Macbook is plugged into the speaker but there is no sound. The reason may be a problem, or the solution proposed under the speaker.How to solve the problem of Macbook program?Is there a built-in speaker?If you see in the window that Digital Out is not a speaker, please cancel any plugged-in Macbook. If the "Output" window device, the internal will help purchase the device option, you need Apple support to seek.PRAM existsThis process can fix some sound-related problems. Command, option (or Al), P, and R at the same time to restart the Mac. Guide the role.What happens if there is a problem with the built-in Macbook?Self-testDetect whether there is a Macbook through hands-free video or music playing sound. Raise the schedule: The schedule has not been lowered. Schedule higher button, usually F12 when pressing the button on the button. When you click on it, if there should be a level on the screen.Check the volume of the speakerIn many cases, I forget to turn on the sound, or there is no sound in the earphone due to poor contact. You need to make sure that there is no sound from the headphones that are not caused by these reasons, and then do the following checks.Check if the speaker is damagedUnplug the headphones/headphones and try to connect them to other devices, such as iPod touch or iPhone, to see if it works.Is there a foreign body in headphonesThere may be something about the port, whether something can be updated. Try to blow air into the port and see it move out. While we are about to solve a problem button, see if we can update some problems. Software: Check that you are running the latest version of macOS for Mac.If none of the above methods can fix the sound problem of your MacBook speaker, it means that the earphone jack is damaged. At this time, you need to purchase parts for replacement.If you encounter Macbook screen failure or Macbook LCD screen damage, or if you run a repair shop, you may need to purchase replacement Macbook LCD screens, or you may need to purchase Macbook repair parts in bulk. Feel free to browse the Macbook repair parts section and find what you need.