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Try to ask for the warranty. They will switch out the Microphone module.

Do it with either power sources, as the laptop works with both power, as it should turn on. But your problem is with the keyboard if the power key doesn't turn the laptop on and the keyboard needs changing.

Below is the A315-41 replacement upper case and keyboard and the power key marked in red, as this comes in a one unit and can't be split up as its riveted together, and if you try to split the upper case from the keyboard, you could damage the upper case and will not be able to replace it with just the keyboard.

Below is the US International language keyboard as an example

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