# Common Troubleshooting Issues

<table><thead><tr><th>Issue</th><th width="135.4000244140625">LED Indicator</th><th>Solution</th></tr></thead><tbody><tr><td>Looking Glass 16" is not powering on</td><td><span data-gb-custom-inline data-tag="emoji" data-code="26ab">⚫</span> Off</td><td>Please check the power adapter 16” comes with is plugged in and uses the cable the unit is supplied with. Re-plug / Reconnect if necessary.</td></tr><tr><td>Looking Glass 16” screen stays black</td><td><span data-gb-custom-inline data-tag="emoji" data-code="1f534">🔴</span> Solid Red</td><td>First, check that the HDMI cable or the USB-C DP alt mode cable is connected securely. <br><br>Also check to see if the computer's USB-C port supports USB-C DP alt mode display output, if 16” is not connected via HDMI</td></tr><tr><td>If you are seeing some rainbow artifacts (i.e. chromatic aberration) on your Looking Glass display</td><td><span data-gb-custom-inline data-tag="emoji" data-code="1f535">🔵</span> Solid Blue</td><td>This will happen when you are plugged into HDMI mode and you do not have either the HDMI or one of your USB-C cables plugged in.<br><br>Ensure that all the cables in your display configuration are plugged in correctly. </td></tr><tr><td>If you notice that some media or applications are running at a slow frame rate. </td><td></td><td><p>First, ensure that your PC or Mac meets the minimum specification requirements for running the Looking Glass 16" Spatial Display content. <br><br>Then, if you're on Windows, ensure that you have Vertical Sync enabled -></p><ol><li>Click the <strong>Start</strong> button or <strong>Windows icon</strong></li><li>Type <strong>NVIDIA Control Panel</strong> into the search bar</li><li>Press <strong>Enter</strong> on your keyboard</li><li>Click <strong>Manage 3D Settings</strong></li><li>Under <strong>"I would like to use the following 3D settings"</strong>, scroll down until you see <strong>Vertical Sync</strong></li><li>Select <strong>Vertical Sync</strong> to choose <strong>Force</strong> on from the dropdown menu</li></ol><p>Lastly, ensure that the graphics card is targeting all the applications that you've installed including the web browser you're using (we recommend Chrome). <br><br>For a detailed breakdown of how to set this for your PC, follow this guide <a href="https://support.ntopology.com/hc/en-us/articles/360043607974-How-to-enable-high-performance-Graphics-Card-settings">here</a>.</p></td></tr></tbody></table>