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Does you monitor has an option to change to HDMI?
Set your TV to HDMI 1 or whichever HDMI port if your TV has more than one.
I know that many laptops have a function key that you press to activate the internal, and the external display, or just the external display. Have you verified that for your system?
I suggest contacting your system manufacturer for better support; your laptop may have some settings that need to be set up in order to connect an external display.