Why any of the keys are not working and a buzzing sound is occurring?

My laptop has 2 operating systems. whenever i start my laptop, it asks for selecting an Operating system. But I need to use the down arrow key to select Windows or an enter key to continue with the first one(UBUNTU).

The problem is any of the keys are not working. and when i am pressing the keys multiple times a buzz sound occurs.

Has anyone faced this problem..? Please suggest possible solutions..

Any help here would be appreciated.

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Hi, Try using a USB keyboard attached to the laptop to see if the problem is in the laptop keyboard or if it is a software problem.

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