HDMI No Signal PC

Step-by-step checks before you replace parts

USB-C dock or hub shows no signal on the monitor

USB-C docks and hubs add firmware, power, and Alt Mode requirements. Microsoft recommends removing docks and dongles early when external monitors fail.

First step: Bypass the dock. Connect the monitor with a direct HDMI/DP cable to the PC or laptop. If direct works, the dock path is at fault.

Steps

  1. Prove a direct connection

    Direct cable success isolates the dock/hub.

    Diagram showing laptop to dock to monitor crossed out, and laptop direct HDMI to monitor with green check
    Bypass the dock to prove the PC and monitor still work.

  2. Use a port that supports DisplayPort Alt Mode

    Charging-only USB-C ports will not drive a display. Try every USB-C/Thunderbolt port.

  3. Power the dock correctly

    Attach the dock’s power brick if it has one. Underpowered hubs drop video first.

  4. Update dock firmware from the dock maker

    Use only the manufacturer’s support site. Then retest Win+P and Detect displays.

  5. Wireless docks

    For Miracast/wireless display issues, follow Microsoft’s wireless display/dock article — wired triage first is still recommended.

What to do next

Direct OK, dock fails Stay on dock firmware/power/Alt Mode checks.
Direct also fails laptop HDMI or homepage desktop tree.

FAQ

Hub worked for data but not video

Data-only hubs lack DP Alt Mode. You need a video-capable dock/hub.

Official sources

Independent DIY troubleshooting. Prefer Microsoft and OEM support articles for model-specific steps. We do not sell one-click fix tools or host driver packs.