iPad second monitor not connecting to Windows?

Before you begin, identify the connection path.

For wireless use, the iPad must reach the PC over the same local network. The PC may connect to the router by Ethernet while the iPad uses Wi-Fi. Internet access by itself is not enough: a guest or managed network may let both devices browse the web while blocking them from seeing each other.

For USB-C, Slate needs a USB-C iPad, a data-capable cable and a working Apple device connection in Windows. A cable can deliver power while failing to carry data, so charging is not proof that the USB path is ready.

Symptom 1: the wireless connection does not start.

If Slate remains on the iPad’s waiting screen or the first pairing code does not appear, check local communication. The iPad advertises its service and Windows automatically discovers the iPad; you do not select a PC from a list on the iPad. Work through these checks in order and retry after each one. A trusted connection normally reconnects without a new pairing code.

1. Open Slate on both devices. Confirm the Windows app is running and keep the iPad app in the foreground while testing.
2. Allow Local Network access on iPad. Open Settings → Privacy & Security → Local Network, enable Slate, then reopen the app. Denied permission can prevent local discovery and communication.
3. Use the same reachable local network. Put the iPad on the main Wi-Fi network connected to the PC’s router. The PC may stay on Ethernet. Avoid guest Wi-Fi for this test.
4. Check for network isolation. Guest, client or AP isolation can block local devices even while the internet works. On a network you control, turn off isolation for the main network. In an office or hotel, ask the administrator or use USB-C.
5. Test without a VPN if policy allows. Some VPN configurations block or reroute local traffic. Disconnect it briefly, retry, then restore it after the test. Follow workplace policy on managed devices.
6. Check Windows Firewall access. Allow Slate to communicate on the appropriate local/private network. Keep the firewall enabled rather than disabling it globally.
7. Retry both ends. Use Retry in the iPad’s Connection help and Refresh display from the Windows tray. If needed, close and reopen Slate on both devices.

If a pairing code now appears, continue to the six-digit pairing check. If a trusted device reconnects without a code but shows no desktop, continue to the display-mode checks. For a fuller explanation of routers, Ethernet and local traffic, read the wireless network guide. Detailed permission and firewall help is available in Slate Support.

Symptom 2: a pairing code appears, but approval fails.

The first wireless connection requires approval on both devices. Slate displays a six-digit code on Windows and iPad so you can confirm that you are connecting the intended pair.

1. Keep Slate open on both devices. Use Retry in the iPad’s Connection help to retry the automatic connection.
2. Compare all six digits. Approve only if the Windows and iPad codes match.
3. Approve on both devices before the request expires. If it times out or either side declines, retry and compare the new code.
4. If a previously trusted PC no longer reconnects correctly, open Connection help on the iPad and choose Forget all saved PCs, then pair again. This clears trust for every saved PC, not just the one you are troubleshooting.

After a successful first pairing, trusted-device reconnection normally does not show a new code. After forgetting all saved PCs, approve the next wireless pairing on each PC you use.

If the first pairing code does not appear and Slate stays on the waiting screen, return to wireless connection checks. For deeper pairing help, go to Wi-Fi and pairing support.

Symptom 3: the iPad charges, but USB-C does not connect.

Power and data are separate capabilities. A charging icon confirms power only. Slate needs Windows to recognise the iPad through a working data connection.

1. Confirm the iPad has USB-C. Slate’s direct wired path is for a USB-C iPad.
2. Use a data-capable cable. Try a known data cable, not a charging-only cable. Connect directly to the PC for diagnosis instead of through a hub or dock.
3. Unlock the iPad. Approve Trust This Computer if the prompt appears, and keep the iPad unlocked during the first test.
4. Install Apple device software. Install or update Apple Devices or iTunes on Windows, then reconnect the iPad.
5. Try another data port. A different USB-A or USB-C port can separate a cable or port problem from Slate itself.
6. Reopen both apps. Once Windows recognises the iPad, open Slate on Windows and iPad. A working USB connection takes priority over Wi-Fi automatically.

USB-C uses the iPad’s device-trust flow rather than Slate’s six-digit Wi-Fi pairing code. If Windows still does not recognise the iPad after the cable, port, trust and Apple software checks, follow detailed USB support.

If the connection succeeds but Windows does not show extra workspace, continue to the display-mode checks.

Symptom 4: the iPad shows a black screen or an Extend-mode message.

Slate requires Windows Extend mode. Windows offers Duplicate for mirroring in general, but Slate does not provide a mirrored desktop: Duplicate and Second screen only show a black screen in Slate. If Slate asks you to use Extend, change the Windows mode first.

1. Press Windows + P → Extend on the PC. Then open Settings → System → Display.
2. Select Identify to find the Slate display. Do not assume it is Display 2; numbering depends on the monitors already connected.
3. Select the Slate display and choose Extend these displays. Apply and keep the change if Windows asks. You can also press Windows + P and choose Extend.
4. Arrange the display rectangles to match the physical desk. If the iPad is to the right, place its rectangle to the right.
5. Drag a Windows app by its title bar beyond the matching screen edge. Keep dragging until it appears on the iPad.
6. If the display is absent, use Refresh display from the Slate tray app, reopen Slate and restart the PC if needed.

If the screen stays black after choosing Extend, or the image is unstable or stuck, move to detailed display support. A black screen alone does not identify the cause. The complete setup guide also shows the Extend and arrangement workflow.

If the symptom changes, follow the new branch.

If the first pairing code appears after network checks, continue with code comparison and approval. Trusted devices can skip the code. If Slate then displays its Extend-mode message, press Windows + P → Extend. If the screen remains black after that change, continue with detailed display support.

If a managed or public network keeps blocking discovery, connect by USB-C when available. Compare the requirements in Wi-Fi vs USB-C. If you need to rebuild the setup from the beginning, use How to use an iPad as a second monitor for Windows.

For driver errors, a persistent black screen, performance issues, account questions or problems that remain after these checks, visit Slate Support. Include the symptom, Windows version, iPadOS version and whether Wi-Fi or USB-C was used.