Lenovo laptop black screen after trying to log in?

At 1st started off as a critical service error with a blue screen of death after trying to fix it I finally been able to get to the log in screen now after logging in a ghostly black stream of the mouse cursor I can't remove the battery because of the screws and I don't know how to do it please help

It has a black screen of death basically

Take it to a workshop.

With no clues from you what model "Lenovo laptop" or its Windows version, or what you did "trying to fix it" or the status of warranty, a good idea is do what David suggested.