I was having the same problem in my dell n5110.i just updated the bios from dell's website.and this solved my problem.it will 99.9% coz 4 of my frnds were having same prob in dell,but they solved in the same way.
Hey guys!! I have dual booted my lappy with win7 ultimate and win8 pro using vhd.i have installed windows8 on vhd,but due to that i can't use the fast start and system rating in win8.so i want to restore my win8 vhd to my hardisk.pls help me.I have 4 partitions on my hardisk i can use any one...