You can download Olphcrack and try and crack the password, or Hiren and reset it. Both are live Linux enviroments so you can manipulate the hash tables in Windows. https://ophcrack.sourceforge.io https://www.hirensbootcd.org
Do you have an external monitor you can hook it up to so you can verify that the laptop is booting? If it is, hold a flashlight up to the (laptop) LCD, can you see what’s displayed? If so, you’re back light is probably out.