It sounds like there may be an issue with your Williams M Grand digital piano. The fact that the display is not working and the piano is making a buzzing sound suggests that there may be a problem with the internal electronics.
Here are a few things you can try:
- Check the power supply: Make sure that the power supply is working properly and that the piano is receiving power. Check the power cord, ensure that it's properly plugged in and that the outlet is working.
- Check the connections: Make sure that all of the connections between the piano and the power supply are secure and that there is no damage to the cables.
- Try a factory reset: Consult the piano's manual for instructions on how to perform a factory reset. This can sometimes fix issues with the internal electronics.
- Check the manual: Consult the piano's manual for troubleshooting steps, it may have some information that can help you.
If none of these steps work, it is likely that there is an issue with the internal electronics and the piano will need to be repaired by a professional technician.
Keep in mind that attempting to repair a digital piano can be dangerous if you're not familiar with the proper procedures and safety precautions. It's best to let a professional technician handle the repair.
It is recommended to contact the manufacturer's customer service or a professional technician to have the piano inspected and repaired.
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