I recently bought a NEW dell inspiron 3543(i5 5th gen) laptop. (I have used ubuntu before as duel boot with my older machines but didn't get this.)
I installed windows 8 and then ubuntu 15.04 to use my laptop as a dual boot machine. Ubuntu worked fine but when I tried to load windows 8 it showed red screen with white stripes. I waited a while and then windows loaded... For a week I waited till that red screen disappear and then used windows.
Today I installed some drivers in windows os and it required a restart. But on that time the red screen appears and never load windows. I waited a long time with patience. But I can't load windows.
*And the worst thing is I can't even access my hard disc(ubuntu says can't mount) though I had turned off fast boot feature in windows long time before.
Any help will be APPRECIATED Additional info:- I have a NVidia graphic card.