I've got a Notebook from my girlfriend and it didn't boot anymore (Display kept black only Light was on).
I didn't work with an external monitor too.
Now I reconnected the VGA connector on the mainboard and now it works just fine with an external Display.
The internal display works too until the login screen of windows.
When only a mouse is displayed the internal display works fine (so no pixel errors or sth like this)
but when the login screen appears the internal display will be black again(mouse is also dissapeared)
The windows loading screen is also invisible so it seems it has a problem displaying colors (because mouse is onlx B&W? )
So I've got no idea whats the problem now...
it's a Lenovo G570
Anyone got an idea?