I plug my HDMI Cable to my laptop and then to my tv Hd socket, and get just a warning sound, the tv flickers but has a blank blue screen.
Check the display settings on your laptop to see if the external monitor output is disabled. There is usually a function key on the keyboard with a picture of a monitor on it which can be used to switch between internal & external monitors.
You may also need to try on another monitor/TV or change the HDMI lead.
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