HCL Laptops — screen not displaying after it got hanged due to heating while updating bios

Address:

Mumbai City, Maharashtra

i have this hcl laptop of n38 series and the worst thing i know about this laptop is it gets heated up too fast and shuts down automatically apart from dat, i was updating driver softwares,was updating hcl bios,suddenly it got heated nd hanged,i switched it off and kept it for cooling , after an hour so, i tried to start this laptop, but found what, nuthin is coming on my screen, i tried it many tyms bt my pc is not getting started, only the light blinks nd i see nuthin on my screen.
what shud i do, now.
all my important data is in that lap,do help me out.