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What kind of laptop, make/model, and what Operating System and software level is it, Windows10/Apple??/Linux???
If it's Win10, is there more than one logon id set up on the Windows login page, like Admin or Administrator? In addition to your name? Can you log in as someone else, and see if you can get started up. If yes, then you may be able to open the Network Troubleshooter, and see what it thinks about the problem.
Could it be a virus or some other malware posing as the Windows Startup screen, trying to get control of your machine? Have you noticed any other odd behavior prior to this issue?