Are you aware of the "F" key that alternates between laptop screen and attached monitor, its different on all laptops and will be displayed with a symbol so press it whith the FN key and see what happens
Further to above comment, one tricky re-install I done required drivers/software for this function to work
This is still not clear as to whether its a hardware or software
Recommend you go to manufacturers website and download and install every single driver update for that laptop then give the F key a try
Further to above comment, one tricky re-install I done required drivers/software for this function to work
This is still not clear as to whether its a hardware or software
Recommend you go to manufacturers website and download and install every single driver update for that laptop then give the F key a try