My sound on the webcam is not working

make sure have installed the drivers for microphone http://www.driverscape.com/manufacturers/acer/laptops-desktops/aspire-5315/619

Have you checked that the mic is enabled in your audio controls? Also in device hardware?

Launch the Logitech QuickCam or Webcam software on your computer. Verify that you see yourself Logitech Webcam software window. Close the software window. Sign in to Skype. Click the "Tools" menu and select "Options." Click "Video Settings," check the "Enable Skype Video" and "Start my video automatically when I am in a call" boxes. Select your Logitech QuickCam from the drop-down list. Your webcam should display video in the window. Click "Audio Settings" if your QuickCam has a built-in microphone and select it from the microphone drop-down list. Check the "Let Skype adjust my audio settings" box in "Audio Settings" so Skype recognizes your microphone. Click "Save" to save the options for your audio and video settings. Skype will close the options menu.

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The problem is either the microphone is not connected/faulty or the wrong microphone is selected in the Skype Audio setting.
To check if the microphone is working - go to Start - All Programs - Accessories - Entertainment - Sound Recorder and do a test recording.
If the sound is doesn't work then open Device Manager - Sound, video and game controllers and check the microphone is enabled and working. If it isn't listed or has a yellow ? against the microphone then you need to install the microphone device driver.
If the microphone is working then open Skype then click on Tools tab -then Options - Audio Settings - then in microphone setting and click on the microphone list to select your model microphone. Then Save your settings.
To test your microphone settings then go to Contact list and select Echo / Sound Test.Service and follow the instructions. If this works then your friends will be able to hear you,

I have a Dell 1545 with Dell web cam central & I've had this issue. The problem is that Dell web cam central installs it's own microphone settings onto your laptop called something like Dell web cam Live!. This isn't the built in microphone in my laptop & maybe not yours either. You have to change the settings for your computer system & Dell web cam central. Go to start> control panel> sound> recording .. on mine there is an option for Microphone "High Definition Audio Device" ... that is the built in mic. You want that for your default & apply it. Also .. as a side note .. I disabled the web cam central Live! microphone completely from this window. Then open Dell web cam central & go to the "Record Video's" option. In the middle of this is an orange button with a video camera icon. Next to this on the same button is a little arrow pointing down .. click that. Under microphone .. choose Microphone "High Definition Audio Device" just like the sound option in control panel. I've done this & it's completely fixed. I can record videos with sound & use my built in mic in voice/video chat.

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Check quick time settings.

See if other video files played in quicktime have voice.

Go to Tools | Options | Audio Settings and Video Settings which is how the audio and microphone settings are adjusted in Skype.

It sounds like you might have two microphones or devices with microphones. Make sure the microphone with the webcam you are using, is selected.

Normal 0 Go to Control Panel and Click on Sounds, Click on Audio, then Click on the Microphone. Then Click on the drop down and select Camera Microphone.
Click OK and it should work.
Hope this helps. Bud