I have a Yamaha DGX 640 keyboard that suddenly makes no sound at all.The power switch for the Kindle Keyboard (not pictured) is located on the bottom edge of the device, next to its microUSB port.While holding down the white key on the right end (C7), press the standby/on switch to turn on the power to this instrument. This operation may delete the backup settings and data saved in the instrument's user memory depending on the model. Try to restart the instrument to the factory settings.From here, you can even choose to create your power plan as well. If you want, you can also go to the "Additional Power Settings" from here to run an optimized or balanced plan on the system. Just go to its Settings > System > Power & Sleep and adjust the settings for sleep and screen time when the system is turned on or hibernated.Method 4: Remove the battery and the power cable To fix the issue, press the keys associated with the problem diagonally (lower left side of the button) for a couple of seconds. This method may work for some specific keys no working on your Lenovo laptop keyboard.You may also visit the Boat Motor Manuals section of our site to obtain a service manual. You are invited to join our public Boat Repair Forum to seek assistance from other members. does not offer troubleshooting assistance or repair advice by email or by telephone.
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