Disabled card graphic in bios = black screen

Hello, I have Acer Aspire v3-771G, mod bios 1.15, and I make fail. I disabled integrated card. When I start laptop I have black screen. Can you say me how can I enable this graphic card? Screenshots and say what I must click to enable graphic. Fast, help please.

http://www.tomshardware.co.uk/answers/id...phics.html - here the same point, but I can't open my laptop.