how to hard reset the BIOS on Lenovo Y560?

[Nikifor6047]

In general, after I reinstalled windows stopped working discrete graphics card driver set , but the card was in the device manager as a standard VGA adapter. And of course , the laptop worked on embedded map.
In the Bios is set to include a discrete piece of iron , resulting in the display goes off completely. The laptop works , loaded windows, but the screen is black.
prompt!
how hard reset BIOS on this laptop ? Battery pull there or a connection from what ....