Bhaio mne samsung np355c5c model laptop lia aur uska display urh gya black screen .phr mene new mother board lgwaya kal he window 8.1 install ki rat ko band kiya laptop acha bhala aur subah on he ni hua. Is sy phly b aesy he hua rat ko chalta laptop bnd kiya subah on ni hua...plzz help