Hi Joyce,

If Sound button is not working in Dell insprion 15 than please go through below mentioned methods to resolve the issue:

Method 1: Use a troubleshooter.
Windows computers come with built in troubleshooters that can help you fix volume issues.

Click on the "Start" bar. Click "Control Panel." On the control panel, click "Troubleshooting" and then "Hardware and Sound."

From there, select the option "Troubleshoot audio playback." Your computer will ask you a series of questions that will help the troubleshooter determine the cause of your volume issue.
In most cases, a volume issue can be fixed using Windows built-in troubleshooter.

Method 2: Check the sound card.
A sound card is a device you need to install in a windows computer in order for the computer to play sound. If your volume is not working, check to make sure your device has a sound card and that it was installed properly.

• Access the search bar on the lower right hand of your computer's screen. Type "Device Manager" into the search bar. This should pull up the Device Manager, which you can use to check your sound card.
• From there, click "Sound, video and game controllers." If a sound card is listed, you have a sound card installed. Your volume issue is being caused by something else. If no sound card is listed, you may have to purchase and install your own sound card.

Method 3:Look at the cables.
Check the cables connecting your speakers, headphones, microphones, or other devices to your computer or laptop. It's not uncommon for cables to become jostled or loose as you're using a computer.

If a cable has come unplugged, this is likely the cause of your volume issue. Reinsert a loose cable and see if the volume on your computer improves.

Method 4: Check for updates.
Sometimes, your sound card may be incompatible with Windows software. In this case, installing any necessary updates can help address the issue.

Windows Update, a feature that updates software to fix errors and bugs, is probably the easiest way to install updates. You can simply click "Install updates" when prompted. You can also manually check for updates by accessing Windows Update through the control panel. This should keep your software up-to-date and fix any sound issues

Method 5: See what playback device is selected.
If sound is not playing from your computer, this may be because the wrong playback device is selected. For example, if the computer is set to play sound through headphones, sound may not come out of external speakers. 

To check the output device, click "start." Then type "sound" into the search bar.Click on the "Playback" tab. See what playback device has been selected for your computer. If it's something other than the device you're using, this is likely the cause of your loss of sound.

I hope this helps.

Regards,
Lokesh

Hello Joyce,

Thank you for posting your concerns here.

If you have problems with your computer particularly with sound/audio, please check your sound card if it is working properly.

1. select Start > (right click) My Computer > Manage
2. In the Management window select > Device Manager
3. Next to Sound, Video and Game Controllers click the + sign
4. A yellow triangle will signify a problem so if one is present, right-click that device and select Properties
5. You can then choose to update the driver

If you have any other questions, please let me know.

Sincerely,

Christian