Hi,
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You've reached the right forum for your question. As I understand that you are getting message no audio devices installed.
Method 1: Step 1: Follow the steps provided below to uninstall the Audio drivers.
a) In the start menu type ‘device manager’, click on settings and then click on ‘device manger’
b) Expand ‘Sound Video and Game Controllers” and right-click on ‘High Definition Audio Device and select ‘uninstall’.
**Step 2:**Follow these steps to install the drivers in compatibility mode and check if that helps.
a) Download the Audio drivers from the manufacturer’s website.
b) Right-click on the driver and click on ‘properties’.
c) Click on the ‘compatibility’ tab and check the box ‘Run this program in compatibility mode for’ and select Windows 7 operating system from the drop down.
d) Click on ‘Apply’ and click ‘OK’ and run the file to install it.
http://support.asus.com/download.aspx?SLanguage=en&p=3&s=371&m=U24E&os=30&hashedid=p4vz2MZqMstldQdZ
Method 2: Check if audio devices are set to default.
a. Press “Windows Key + C” to open a “Charms Bar”
b. Go to settings and type control panel and select sound.
c. Click the Playback tab. Notice the check mark next to the default device. For most users, the default device is Speakers. Make sure that your audio settings are configured as expected. Follow these steps:
d. On the Playback tab, select the playback device, click Properties, click the Advanced tab, and make sure that the Default Format is set to the value that you expect. When you finish, close this window to return to the previous window.
e. On the Playback tab, select the playback device, click Configure, and then make sure the configurations are set correctly.
f. Select the sound device that you want as the default sound device, and then click Set Default.
g. Click OK to save your settings and to close the Sound dialog box.
Also refer: No sound in Windows
Hope this information is helpful and do let us know if you need further assistance. We will be glad to assist.