How to use the front buttons and inputs on your CommBox Classic S4
Your CommBox Classic S4 includes physical buttons and front-facing ports for quick access. This guide explains how to use them to power on the screen, connect devices, and enable touch.
Applies To
Applies to: Classic S4, Classic S4+
Front Button Functions
The front of your CommBox Classic S4 features a Power button, which can:
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Wake up the screen (from standby)
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Put the screen into standby (with a quick press)
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Fully power off the screen (with a long press)
💡 Tip: The CommBox also has a main power switch at the back near the power cable. Use this to completely shut off power if needed.
Understanding the Power Indicator Light
The Power button has a status light that helps you understand the screen’s current state:
| Light Status | Meaning |
|---|---|
| Off | Not receiving power |
| Red (solid) | Standby mode |
| Red (flashing) | Shutting down |
| White | Powered on and operational |
Using the Front Input Ports
The Classic S4 has a variety of front-facing ports for fast, temporary connections:
| Port | Function |
|---|---|
| USB-C | For display, touch input, 65W charging, and media transfer (Thunderbolt 3.1, 4K @60Hz) |
| HDMI | For connecting laptops or devices with HDMI output (4K @60Hz supported) |
| Touch (USB-A) | Enables touch control when used with HDMI-connected laptops |
| USB (x2) | Plug in USB sticks, cameras, keyboards, or mice |
💡 Note: For full functionality (e.g. touch + video), pair HDMI with the matching Touch port.
When to Use Front Inputs
Front ports are perfect for:
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Visiting teachers or presenters connecting their own laptop
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Plugging in a USB drive to show a file
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Quick charging or mirroring from a USB-C device
📁 To access USB files, open the Files app and tap the USB folder.
Troubleshooting / What to Do If It Doesn’t Work
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No image after connecting HDMI?
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Make sure the connected device is turned on and outputting to the correct screen
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Try switching inputs via the remote or Launcher
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Touch not working?
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Ensure the USB touch cable is also connected (if using HDMI)
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Try a different USB port or cable
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No power?
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Check both the front Power button and the main switch on the back of the screen
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