black screen samsung notebook

Hi,

This is the notebook
http://www.samsung.com/uk/support/model/NP-R540-JS03IT

This is the mobo
http://www.s-manuals.com/motherboard/samsung_bremen2-l

I unlocked the bios and i changed the Chipset->GPU option, now the screen does not turn on.

This also happened on a desktop, but i managed to reset the bios settings using the jumper, while here i cannot find a way to reset the bios.

Any help?

Thanks

Are you not even able to enter the BIOS and to restore your previous setting?

no screen, i can t see anything
hdmi does not work either so i thing it is looking for the wrong gpu

i would like to know the procedure to reset a notebook

What happens, when you hit the "DEL" key while booting (or the appropriate other key to enter the BIOS of your notebook)?

nothing

the pc is on, the fan and the hdd are spinning but the screen is black

anyway, even if it can load the bios, i cannot change any setting because there s no screen