Hi Marlorence_GT,
Thank you for reaching Microsoft Community. We're sorry for the trouble this has caused you.
Allow me to ask questions on your end to better isolate what is causing the issue.
May I know what is the make and model of the external monitor you used?
Have you also test other HDMI cable or test the cable with other external monitor?
What exactly will happen when trying to project the display ? A photo of the error would be more helpful.
I'll be waiting for your answers in order to provide accurate resolution.
Kind regards,
Lavenia