The MacBook Pro A1278 uses proprietary Cirrus Logic audio chips. Windows 10 cannot always identify these automatically, resulting in a "No Audio Output Device is installed" error.
If you want, I can provide direct links to the Boot Camp Support Software versions commonly used for the A1278 and recommended Realtek driver packages (state whether you’re running 64‑bit Windows 10).
Right-click the Windows Start Menu button and select . Apple Macbook Pro A1278 Audio Driver Windows 10
How to Install the Apple MacBook Pro A1278 Audio Driver on Windows 10
If you do not want to reinstall your entire operating system just for sound, you can bypass the internal sound card entirely: The MacBook Pro A1278 uses proprietary Cirrus Logic
Navigate to the following path: BootCamp > Drivers > Cirrus (or Realtek , depending on your specific A1278 production year).
: For a few dollars, you can purchase a USB to 3.5mm audio adapter (sometimes called a USB sound card). This device acts as an external sound card, plugging into your USB port and providing a new headphone jack. Windows 10 usually recognizes these devices automatically without the need for extra drivers. Right-click the Windows Start Menu button and select
Go to the tab and check the box to Disable all enhancements . Click Apply and OK . Conclusion
Restoring sound to an Apple MacBook Pro A1278 on Windows 10 requires manually bridging the gap between legacy Apple hardware architecture and modern Microsoft operating systems. By utilizing Apple's legacy Boot Camp 5.1 packages and executing them via administrative compatibility mode, your laptop's integrated Cirrus Logic or Realtek sound system will function flawlessly, allowing you to maximize the productivity of your machine.
The number one reason for the "No Audio Device" error (often accompanied by Code 10 in Device Manager) is that you installed Windows 10 in UEFI mode .