If a red light is visible in the audio-out port when sound should be playing, the internal switch is stuck in the position for digital output.
If the Mute boxes are checked, uncheck them. *Step 4:* Double click the driver and install. Select Built-in Output from the list on the left. Select Properties> Compatibility > run in compatibility mode Select Windows Vista from drop down menu and Click OK Step3: for Windows 7 only: Right Click on exe file of driver. After resetting both the NVRAM and SMC, use your Mac to determine if you still have no sound output. *Step 2:* Extract the right type of Driver (depending on your windows XP/ 7/ 32 bit/ 64bit) +(As a request, please do not hotlink this file anywhere else or our server will automatically remove the file from server.)+ +In case the above download link does not work google+ *Step 1:* Download the Macbook Pro Cirrus Logic CS4206A Driver from our server. Click the Output tab, then select the built-in speakers. From the Apple menu, choose System Settings (or System Preferences).
In macbook pro, you may also see a red light in your audio jack. First, disconnect any cables from the USB, Thunderbolt, or 3.5mm audio ports on your Mac. I tried downloading the 'High Definition Codecs' driver from Cirrus Logic's website but the download link doesn't work. may work with Windows 8 or have new drivers (definitely), shame that Boot Camp 5.x package leaves things out still I guess.
