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This is the common issue experienced by most of computer users.

Follow the below steps to fix no sound issue on windows 7 computer:

Adjusting audio Settings: Make sure that the volume settings are set properly. 1. Click on Start and select Control Panel. In Control Panel, click Hardware and Sound. 2. Now select Adjust System Volume under sound. Adjust the system volume by moving the slider up. 3. Click on Start and type Sound in search and select Sound from the results list. 4. Double click the Sound option and in Playback tab select Speakers option. This option must be set as default. 5. You can verify it by opening the Mixer from Volume. You may also try changing the audio device to other one to check the audio issue. Right click on Speakers option and you can try Configure Speakers or Test to test the functionality of your audio device. 6. You can also test the audio from Sound options. Open the Sound window and select the Sounds tab, select any option in Programs which has sound icon beside it and click Test. Ensure that the mute is not enabled.

Windows 7 Troubleshooter: Windows 7 has a troubleshooting application Find and fix audio playback problems which automatically detects the audio issues of your computer. To open Windows 7 troubleshooting application, click on Start and type audio in the Search field and when the application appears in the results select it. This application detects your audio problem and you have to follow the on-screen instructions to resolve the no sound issue.

Perform System Restore: If the issue you are experiencing with the sound is a recent one, you can use the option System Restore to fix the issue. To perform System Restore, click on Start. Type System Restore in Search, Select System Restore and perform the onscreen instructions to restore the computer to an earlier state so that you can get sound in your computer.

Reinstall or Update Sound drivers: If the problem persists, reinstall and update sound drivers. To Reinstall or Update sound drivers, perform the following steps: 1. Type Device Manager in Start Search, open Device Manager by clicking on it. 2. Click on "+" sign next to Sound, video and game controllers. 3. Now right click on IDT High Definition Audio Codec or Realtek High Definition Audio and select Uninstall. This will uninstall the sound drivers. Windows will prompt to restart the computer, in this case restart your system. If windows does not prompt, you can reinstall the drivers by clicking on the option "Scan for Hardware changes". Windows will automatically detect the changes and will reinstall the sound drivers. 4. I would recommend you to install the latest audio drivers from your computer support website. The laptop manufacturer website will have the latest drivers available. We can install these drivers to fix the sound issues. Therefore once you uninstall the drivers, visit your laptop website and download the latest one specific to your laptop model and operating system. If you are experiencing the issue after upgrading from Windows XP or Vista to Windows 7, it might be due to the missing or incompatible drivers for Windows 7. You can fix the issue by uninstalling the existing drivers and reinstalling the audio drivers for Windows 7. 5. Reinstalling or updating the audio drivers fixes most of the sound issues in computer. If the audio device is not shown under "Sound, video and game controllers", it will be present under unknown devices. Make sure that it is enabled if it is disabled. Right click on the device and select Enable to enable the device and perform the reinstalling steps to resolve the no sound in windows 7 problem. 6. If Sound device is not present under Sound, video and game controllers, you can check it by clicking on Action menu in Device Manager and Selecting Scan for Hardware Changes.

Verify Controls And Connections: Laptops have their own volume control, make sure that they are enabled. Usually laptop have Fn + F(key number) key number changes for each laptop model. If you are experiencing the issue in desktop computer, verify that connections between the computer and speakers are properly connected. Check if the sound cables are working, you can test the issue by using other cables if available.

Install Missing Codecs: If you are experiencing the problem while playing a file on media player the issue is most likely due to audio codes that might be missing, so make sure that you have all the required sound codecs. If the sound device is not yet detected and the problem still persists, the final step you can do is to remove and reinsert the sound card by following the steps in the manuals for your computer model and check the sound.