Fix Dell P2418HZ webcam not working

The short answer

The Dell P2418HZ has a pop-up webcam and microphones built into the monitor. When they stop working, the cause is usually one of four things. The camera may be pushed down into its hidden position. The USB upstream cable may not be connected between the monitor and the computer. The operating system may be blocking camera or microphone access. Or the app may be using a different camera or microphone, such as a laptop's built-in one.

The most important factor is whether your computer detects the monitor's camera at all. If it doesn't, focus on the physical camera and the USB connection. If the camera is detected but you still get a black screen, an error or no sound, focus on permissions and which device the app has selected.

Video cables such as HDMI or DisplayPort only carry the picture to the screen. The webcam and microphones communicate with the computer over USB, so a monitor that displays perfectly can still have a camera the computer can't see.

Webcam or microphone: which part is failing?

Camera video and microphone audio are separate inputs, even though they sit in the same housing. Check which one is failing before you change anything.

• Detection: the operating system recognizes that the device exists.
• Access permission: the operating system or browser allows a particular app to use it.
• Active input selection: the app is actually set to use this camera or microphone rather than another one.

Each of these can fail on its own. For example, a camera can be detected and permitted but still not in use because the meeting app has picked another webcam. The checks below follow that order.

Checks that narrow down the cause

1. Make sure the camera is raised

The P2418HZ webcam sits in a pop-up module at the top of the monitor. It doesn't capture video while it's pushed down into the bezel. Press it so it rises fully, then test again. If video appears, the camera was simply retracted. If nothing changes, keep the camera raised and move on to the connection check.

2. Confirm the USB upstream cable goes to the computer

Look for a USB cable running from the monitor's USB upstream port to a USB port on your computer. Without this cable, the computer can't reach the camera or microphones.

If the cable runs through a dock, hub or extension, connect it directly to a port on the computer for testing, and try a second port. If the camera starts working on a direct connection, suspect the dock, the hub or the original port. This check only tells you whether the USB path is working. It says nothing about permissions or app settings.

3. Check whether the operating system detects the camera and microphones

On Windows, open Device Manager. Look under Cameras for the camera and under Audio inputs and outputs for the microphones. On macOS, open System Information and look in the USB section, or check the input list under Sound in System Settings.

Exact device names can vary by operating system and driver, and this guide can't confirm what yours will be called. One way to identify the monitor's devices is to unplug the USB upstream cable and see which entries disappear.

What the result means: if the devices appear, the USB connection and basic recognition are working, so move on to checks 4 to 6. If they don't appear, go back to the camera position and USB connection, or try a different computer. A device that appears with a warning icon in Device Manager points to a driver problem on Windows. Detection alone doesn't prove the camera can produce an image or that the microphones pick up sound.

4. Test in a simple built-in app

Open the Camera app on Windows or Photo Booth on macOS. If the app offers a choice of cameras, select the monitor's camera. For the microphone, open the input settings in Sound settings and speak while you watch the input level meter.

If video and sound work here but not in Zoom, Teams or a browser, the hardware and connection are fine. The problem lies in that app's permissions or device selection. If the camera fails even in the built-in app, the problem is more likely the OS-level permission, the driver or the hardware itself. This test only covers the app you ran it in.

5. Check camera and microphone permissions

Windows 11: go to Settings > Privacy & security > Camera. Make sure Camera access is on, Let apps access your camera is on, and the specific app is allowed. Desktop programs have their own setting, Let desktop apps access your camera. Check the same settings under Microphone. On Windows 10, these settings are under Settings > Privacy.

macOS: go to System Settings > Privacy & Security > Camera, and separately to Microphone. Make sure the app is switched on. Some apps need to be quit and reopened after you change these settings.

Browsers: in a browser-based meeting, check the site permission. This usually appears as a camera or lock icon in the address bar. Also check the browser's own camera and microphone settings. If the site was blocked earlier, it may stay blocked until you change the setting.

6. Check which camera and microphone the app is using

In the video or audio settings of your meeting or recording app, pick the P2418HZ camera and microphone by name. This matters most on laptops, because apps often default to the built-in webcam and microphone.

The camera and the microphone are selected separately. Switching to the monitor's camera doesn't switch the audio input, and the reverse is also true.

7. Close other apps that may be using the camera

On many systems, only one app can use the camera at a time. If another meeting app, recording tool or browser tab already has it, a second app may show a black image or an in-use error. Close the other apps completely, including any background or tray icons, then retest.

What to change, and how to confirm it worked

Start with the fix that matches what you found, and begin with the easily reversible changes. After each change, retest the original symptom in the same app where it first appeared.

Finding | Change | How you know it worked

Camera was pushed down | Raise the pop-up camera | Live video appears in the app

Camera and microphones not detected | Connect the USB upstream cable directly to the computer and try another port | The devices appear in Device Manager or System Information

Works directly but not through a dock or hub | Keep the direct connection, or troubleshoot the dock separately | The camera works reliably on the direct connection

Works in the built-in app but not in another app | Allow access for that app or browser site, then restart the app | The app shows video or detects audio

App shows the wrong camera or microphone | Select the P2418HZ devices in the app's settings | The preview shows the monitor's view, or the level meter moves when you speak

In-use error or black image | Close other apps that use the camera | The camera starts in the app you want

Drivers and updates

If the camera or microphones appear with an error in Windows Device Manager, or they stopped working after an update, reinstalling the device can help. In Device Manager, right-click the device and choose Uninstall device. Then unplug and reconnect the USB upstream cable, or choose Scan for hardware changes. Windows usually reinstalls the driver it uses for the device.

While you do this, the camera or microphone will be unavailable to apps. Some apps may reset their device choice, so check the selection again afterwards.

Before you install any separate driver, firmware or monitor reset, look up the P2418HZ on Dell's official support site, ideally using the monitor's service tag. This guide can't confirm whether Dell lists a dedicated webcam driver or firmware update for this model or your operating system. Use only what Dell provides for this model, and follow its instructions.

A factory reset of the monitor's settings is unlikely to fix camera or microphone access, which depends on USB and the operating system. It will also undo any display adjustments you've made.

When to stop and contact Dell

Contact Dell support if any of the following is true:

• The camera is raised and the monitor is connected directly by USB, but the camera or microphones don't appear on two different computers.
• The camera is detected but shows no image even in a built-in camera app, with permissions allowed and no other app using it.
• The device keeps showing an error after a reinstall.

Each of these points to a possible hardware or cable fault, beyond what settings can fix. Have the service tag ready, and note which checks you ran and what each showed. That helps the support team skip steps you've already covered.