If you're not getting any images on your laptop's screen at all but you are when plugged into an external monitor, it sounds like the display is busted. Meanwhile, not being able to boot into Windows seems like a completely different problem to me. Reinstall your operating system if possible, then when/if that doesn't fix your display issues, replace your screen.
Alternatively, get a new laptop. 8 years is a darn good life-span for a laptop. >.<