The notebook's miniDP output is not displaying any signal on the HDMI monitor?

1. Prioritize checking the compatibility of the adapter and the cable.
1.1 Confirm whether the adapter supports protocol conversion: For minidp to hdmi conversion, it needs to be compatible with the DisplayPort to HDMI signal protocol. Some low-priced adapters may fail to provide signals due to poor chip compatibility (such as not supporting HDCP copyright protection).
1.2 Check version compatibility: If the laptop minidp is version 1.2, it needs to be paired with an adapter that supports version 1.2 protocol to avoid signal output failure due to version incompatibility.
1.3 Eliminate poor contact: Replug both ends of the adapter (laptop minidp interface, display hdmi interface), clean the interface dust, to avoid signal interruption due to looseness or oxidation.

2. Set system and display parameters.
2.1 Open the laptop display settings (Windows press Win+P, Mac press Command+F1):
• Select "Copy" or "Extend" mode to confirm if the system recognizes the external display;
• If not recognized, click the "Detect" button to manually search for the external device;
2.2 Adjust resolution and refresh rate: In the display settings, set the resolution of the external display to its native resolution (such as 1920×1080), and match the refresh rate with the output capability of the laptop (such as 60Hz), to avoid signal output failure due to incompatible parameters;
2.3 Check graphics card driver: Update the graphics card driver (download the latest version from NVIDIA/AMD/Intel official websites), as some old drivers may not support signal output from the adapter.

3. Troubleshoot hardware faults.
3.1 Test the compatibility of other devices: Connect the adapter to another laptop minidp interface or display hdmi interface to confirm if the adapter is damaged;
3.2 Check interface hardware issues: If the laptop minidp interface has been damaged by external force (such as bent pins), or the display hdmi interface is faulty, contact the after-sales service for testing;
3.3 Try active adapter: If the passive adapter (without additional power supply) cannot be used, replace it with an active adapter with USB power supply to solve the signal attenuation problem (applicable for 4K and higher resolution output).

4. Special scenarios handling.
4.1 External power supply for laptops: Some lightweight laptops may limit the minidp output power in battery mode. Try connecting a power supply after retrying;
4.2 Additional settings for Mac system: Mac needs to check "Mirror Display" in "System Preferences - Displays" or hold the Option key and click the "Zoom" option to manually match the display parameters.