When your ZenBook 14's second screen isn't showing up, it can feel like half your workspace just vanished. The issue often comes down to a simple setting, a driver that needs a refresh, or a quirk with the unique ScreenPad on certain models.
Let's get that display back. I'd start with the quickest fix first, which is the Windows projection shortcut. Press Windows + P on your keyboard. A menu will pop up on the right side of your screen. Make sure it's set to Extend or Duplicate, not "PC screen only." This is the most common reason a monitor isn't detected.
Check Your Physical Connections
Unplug the video cable from both your ZenBook and the external monitor, then firmly reconnect it. If you're using an adapter, like USB-C to HDMI, try reseating that connection too. A loose connection is an easy thing to miss.
It's also worth trying a different cable if you have one handy. Cables can fail internally without any visible damage. While you're at it, double-check that the external monitor is powered on and set to the correct input source, like HDMI 1 or DisplayPort.
Run a Hardware Diagnosis
ASUS includes a great tool for this. Open the MyASUS app on your laptop. Navigate to System Diagnosis and look for a display or hardware test. This built-in checker can quickly tell you if there's a known issue with your video ports.
You can also use it to check your battery health and run fan diagnostics, which is handy if you've noticed other odd behavior. It's the first place I go for any hardware-related glitch on an ASUS machine.
Update Your Display and ScreenPad Drivers
Outdated graphics drivers are a prime culprit. For the main display, open Device Manager, expand Display adapters, right-click your Intel or NVIDIA GPU, and select Update driver. Choose to search automatically.
If your ZenBook 14 has the ScreenPad secondary touch display, it needs its own driver. Head to the ASUS support website, enter your exact model number, and download the latest ScreenPad driver from the utility section. Installing this has resolved detection issues for many users.
Use Windows Display Settings
Go to Settings > System > Display. Click the Detect button. Windows will actively search for any connected displays. If your monitor appears, click on its representation and scroll down to ensure the display is set to "Extend desktop to this display."
Sometimes, Windows sets an unsupported resolution. Try lowering the resolution for the external monitor to a common standard like 1920x1080 to see if that brings the picture back.
Try a Different Video Port
The ZenBook 14 typically has both an HDMI port and USB-C ports that support DisplayPort Alt Mode. If your monitor isn't working via HDMI, try connecting it through a USB-C to HDMI or USB-C to DisplayPort adapter.
This helps you figure out if the problem is with the specific HDMI port or a more general software issue. If it works via USB-C, you might need to focus on HDMI-specific drivers or there could be a hardware concern with that port.
Check for Thunderbolt Firmware Updates
For models with Thunderbolt 4 support, a firmware update can be critical for display output stability. These updates are often separate from regular driver updates. You can find them in the MyASUS app under "Live Update" or in the "Customer Support" section of the ASUS website for your specific model.
Applying the latest firmware ensures the USB-C/Thunderbolt controller properly handles video signals. It's a step that's easy to overlook but can make a big difference.
Reset Your Graphics Display Driver
You can do this quickly with a keyboard shortcut. Press Windows + Ctrl + Shift + B. Your screen will flicker briefly as the graphics driver restarts. This is a safe way to refresh the display stack without a full reboot and can jolt a second screen into being recognized.
For a more thorough reset, go to Device Manager. Right-click your display adapter and select Disable device. Wait about ten seconds, then right-click it again and choose Enable device. This forces a full re-initialization.
Review BIOS Settings for Display Output
Restart your ZenBook 14 and press F2 repeatedly as it boots to enter the BIOS. Navigate using the arrow keys. Look for settings related to display, graphics, or external video.
Ensure any options for the integrated GPU or display output are enabled. Be cautious in the BIOS; only change settings you understand. If you're unsure, the default settings are usually correct. Exit and save changes if you made any.
