I understand that the internal microphone is not working.
No worries, as I'll be glad to help you, that said, I'll need a few more details to dissect your concern & provide an accurate solution:
Have you been ensured it's enabled on recording devices under speaker?
Did you reinstall the drivers?
While you respond to that, here's a few things that should help:
There are a number of options in Windows sound settings that need to be configured so that the computer recognizes and works with the microphone. Use the steps below to modify the sound configuration as necessary for your microphone.
Open the Sound window
Connect the microphone to the computer.
In Windows, search for and open Sound.
The Sound window opens.
Click the Recording tab in the Sound window.
Figure : Recording tab in the Sound window
Then use the following steps to troubleshoot the microphone.
Step 1: Make sure the computer recognizes the microphone
In the Sound window, click the Recording tab.
Right-click an empty area of the Sound window.
Click Show Disabled Devices and Show Disconnected Devices.
Figure : Disabled and disconnected devices shown in the Sound window
If the microphone is listed as Currently unavailable or Not plugged in, disconnect it, then reconnect it to the port. If the microphone is still not detected, refer to the Check the microphone section of this document.
Test the microphone by speaking into it.
Look at the gray bars next to the device name on the Recording tab:
If the gray bars next to the device name change to green, the device is active and an audio signal is passing through the microphone port. The issue should now be resolved.