My extended monitor shows only black screen but before it, it shows normal display but makes a strange sound after having changes in the screen settings then goes black again. What might be causing it?
BTW i'm using a lenovo y570 laptop and i used only the nvidia graphics card instead of the intel hd.
Extended screen display on my laptop?
Guest
Dual GPU configurations often encounter this type of problem, go to the catalyst options screen by right clicking the desktop. There you can choose to disable the intel gpu and only use AMD. I'm assuming you have an AMD gpu. The same works for nvidia but I'm not sure how to find the option. Any way, after making the changes try the extended desktop again.
Also, are you connecting both monitors to the laptop? Both must be connected to the laptop ports to allow this, even if it is one in hdmi and the other in vga or vga and dvi. If you are splitting the connection only cloning is supported!
roman