So i reinstalled windows 8.1 in my Inspiron N5110 laptop, everything was going fine, until, I installed video card drivers, then everything just went off. When I connected it to external monitor via VGA, external monitor started working normally, but laptop's display just won't turn on. When I'm booting the PC, everything shows up in laptop's display, untill windows boots up.
May be there is a problem with bios issue for some dell computers try flashing(updating) the bios using a tool which will be found on the dell support page that may help you or try with the driver which are up-to-date that may help you. Also have a look at this discussion http/en.community.dell.com/support-forums/laptop/f/3518/t/19492303 which may help you.
The BIOS didn't suddenly go bad on a unit that was working fine before. Installing new drivers doesn't cause any issues with or even have anything to do with, the bios. If you don't have a realistic solution to offer or are not asking for clarification about the issue, don't answer. Don't just throw a bunch of senseless answers in the wind or you're likely to cause somebody a bigger issue than they already have.
And that discussion, about the power not turning OFF, has nothing whatsoever to do with this issue. If you can't post answers that are relevant to the thread, please refrain from posting at all.