How to Set up an External Monitor on u310

i use the  hdmi adaptor  to connect to a tv with a pc port
even if i set the display in  double mode ( my laptop plus ext monitor ) as soon as i insert the hdmi plug , with no connection to the ext monitor , the screen comes out black
how to set  my  pc to avoid it ?
thanks  
pietro

Dear pgerratico
Welcome to Lenovo forums
could you please try to connect the HDMI while the machine is off and start it and see will it be displaying on the external monitor or not and the computer screen aswell
Thanks
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