The most common solution for fixing sound driver not installed or incompatible with your laptop is the incorrect settings, or the microphone is not plugged in correctly. Other solution you might try is to reinstall your Toshiba Satellite L505 drivers in order to make the Realtek microphone works.

When upgrading or changing the Windows OS on the laptop, it would normally set the default settings for sound drivers or software. The outdated sound driver or software might not be able to work again and must be removed from the system. If that’s the case, you have to download the new laptop drivers and install the new sound driver to your Toshiba Satellite L505.
Take note that not every audio driver is created equal. The sound performance is relying on the sound driver quality. Before downloading one, check your audio settings first and double check to ensure that correct driver is being displayed and activated. In order to do this, click Start > Control Panel > Sound and Audio Devices > Audio. See if the driver you have is selected on the dialog. Newer Windows OS can look on Start > Control Panel > Hardware and Sound > Change System Sound > Recording. From there you can select default microphone you can use.
After you have corrected the settings, you might have to restart your laptop to make it work. Check whether the mute option is already deactivated. Check the cable and see if the cable is connected properly on the correct jack. Depending on the Toshiba Satellite L505 specs, you can look the jack located on the body of the laptop. See the manual to make sure which jack to use.
If it doesn’t work, it might because the Satellite L505 drivers are corrupted or incompatible with the OS version. Remember to uninstall your sound driver first before installing the new one to ensure proper installation.
Download Toshiba Satellite L505 Realtek Microphone Driver
This driver is compatible with Microsoft Windows 7 and can be used on Toshiba Satellite L505 or L505D. Download both parts, run it on your laptop and follow the instruction to complete the installation.
Download part 1 here
Download part 2 here
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