How to detect microphone in laptop
I think it would be better if we check that the built-in microphone is working on your machine.
The internal microphone is located near the top of the notebook LCD display or near the bottom of the LCD display near the hinge. Use the following best practices to better capture sound with the microphone.
-Adjust the notebook PC screen to place the microphone in the best direction for receiving sound.
-Speak directly into the microphone. Avoid speaking away from the microphone.
-When using the internal microphone, choose an environment without background noise.
Testing the record function on the notebook PC
1. Click Start , then Programs , Accessories , Entertainment , and then Sound Recorder .
2. Click Record (the red dot) and speak into the microphone.
3. When you are finished recording, click Stop (the gray rectangle).
4. To play back the recording, click Play (the gray arrow pointing to the right).
If happens that the recording with the microphone have no sound we have check the settings.
Checking microphone settings
1. Click Start , then Programs , Accessories , Entertainment , and then Volume Control .
2. A Volume Control or Master Volume window opens.
3. Click Options , and then Properties .
4. Select Recording , and make sure Microphone is selected.
5. Click OK . The Volume Control window should change to a Recording Gain Control window.
6. Click Options again and then click Advanced Controls . If Advanced Controls is unavailable, then an alternate microphone is not available. Proceed to the next series of steps.
7. Remove the check next to Alternate microphone , click Close , and test the microphone. If there is still no sound, continue to the next step
Ensuring the correct recording device is selected
1. Access sound properties:
-In Windows XP, to access the sound control panel applet, click Start , then Control Panel . Click Sounds, Speech, and Audio Devices , and then click Sounds and Audio Devices .
-In Windows 95, 98, and Me, click Start , Settings , and Control Panel . Double-click Sounds and Multimedia , or Multimedia . The Sounds and Multimedia Properties window opens.
2. Click the Audio tab.
3. Under Sound Playback , select the audio device that is installed on the computer (there should be only one).
4. Under Sound Recording , select the audio device that is installed on the computer. It should be the same as the listing under Sound Playback .
5. Click OK .
6. Close the Sound and Multimedia Properties window and test the recording.
Feel free to reply if happens the steps I've told you is not working. Hope it helps.