I haven't used my pc in about a week but just went back to it today. Upon opening it the screen remained black with only a white dash in the top left so I decided to just restart the computer. The same thing happened only the line was now more towards the centre of the screen. This appears immediately after turning the computer on so i cant press f8 or anything like that to access any other page it just stays on that screen. Anyone know anything about this? I would appreciate some help!