When it comes to laptops one thing that can occur while using one are some of the tabs on the keyboard not working. Especially the ones you use to log in
This problem can be caused by pressing down on the tabs to hard or too much.
While the best and usual way of solving the problem is getting the thing fixed, other ways to deal with the situation would involve connecting a keyboard from a computer console to the lab top and use it to help you sign in and with the on-screen keyboard that you would use while the laptop is turned on, it would help improvise on typing and saving you a lot of money when saving it for something else