Black screen appears after Windows login

Establish the scope

Confirm that the sign-in screen displayed normally before the desktop went black. If Ctrl+Alt+Delete or Task Manager is visible, the display can still show Windows output and the shell deserves attention. A monitor with no signal even before sign-in requires a different cable, display, or startup check.

Apply the safer fix first

In Task Manager run explorer.exe if the shell is absent. Use Win+P carefully and disconnect an unnecessary external monitor.

Investigate the cause

Test Safe Mode. If it works, inspect startup software and roll back a display driver changed immediately before the issue.

Protect the recovery path

Save accessible work before restarting the shell or changing drivers. Keep a working display and account password available before recovery testing.

Verification

• Sign in to the original account and confirm the desktop, taskbar, and an ordinary application appear.
• Repeat the original monitor arrangement after a normal restart, rather than declaring success only on an alternate screen.

When to stop

Do not continue with broader resets when no display appears before login, recovery is inaccessible, or data is unbacked up. Preserve the observations already collected and use the device maker, network administrator, Microsoft support, a qualified repair technician, or data-recovery help according to the evidence.

Review the safe troubleshooting workflow before any broader recovery step.