Here are some steps to troubleshoot this issue:
- Check connections and make sure all plugs are securely seated.
- Make sure the external monitors are in the correct power and video mode.
- Toggle the display options on the laptop (e.g. Fn + F5 or Menu button).
- If possible, switch the cable or try plugging the external monitor into another device.
- Ensure the device’s driver and firmware are up-to-date.