Hi Guitarlover67,
· How do you mute the sound?
· Is it from the taskbar? Or do you have any media buttons set on the laptop keyboard?
· Have you pinned Excel application to the taskbar?
· What is the model number of the laptop?
If it is keyboard button then I would suggest you to reinstall HP keyboard drivers.
Regards:
Samhrutha G S - Microsoft Support.
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