---
title: Why are the displays connected to the VT200 not functioning?
description: Learn why displays connected to the VisionTek VT200 may not work and why your computer's USB-C port must support DP Alt Mode.
---

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September 15, 2026

# Why are the displays connected to the VT200 not functioning?

The **VisionTek VT200** uses your computer's USB-C **DisplayPort Alternate Mode (DP Alt Mode)** to send video to connected displays. If your computer's USB-C port does not support DP Alt Mode, the connected displays will not receive a video signal.

**Important**

- Your computer's USB-C port must support **DisplayPort Alternate Mode (DP Alt Mode)**.
- Not all USB-C ports support video output.
- Check your computer manufacturer's specifications to confirm that the USB-C port supports DP Alt Mode.
- Make sure the display cables are securely connected to the VT200 and your monitors.
- Make sure your monitors are powered on and set to the correct input source.

If your USB-C port does not support DP Alt Mode, the VT200 cannot provide video to your external displays through that connection.

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