Windows won’t start

PC boots but the lock/login screen never appears

Windows seems to finish loading (past the logo and spinning dots) but then shows only a blank background, a solid color, or nothing at all instead of the expected lock screen or login prompt.

Difficulty
Moderate
Time
20–60 minutes
DIY cost
$0
Pro cost
$80–$180

Symptoms

  • Loading appears to complete but no lock screen or password prompt shows
  • Screen may be blank, black, or a solid background color
  • Mouse cursor may or may not be visible and movable
  • Ctrl+Alt+Delete may or may not bring up any response

Likely causes

  • CommonGraphics driver failing to render the lock screen UIA driver issue can leave the underlying system running while the visual login screen fails to display.
  • CommonCorrupted lock screen or login UI componentsDamage to specific Windows shell components can selectively break just this screen.
  • PossibleA stuck background process delaying the login screen's appearanceSome services or startup tasks can hold up the transition to login.
  • PossibleMonitor or display connection issue coinciding with this stageA borderline cable or port issue can happen to manifest right at this point in loading.
  • Less commonWindows Update related shell component issueOccasionally an update leaves shell-related components in a broken state.

What to do

  1. Wait a few extra minutes beyond what seems reasonable, since a genuinely slow login screen can look identical to a stuck one initially.
  2. Try pressing Ctrl+Alt+Delete; if a menu appears, choose Task Manager and then File > Run new task, typing 'explorer.exe' to attempt to force the shell to load.
  3. If nothing responds at all to Ctrl+Alt+Delete, force a restart by holding the power button 10 seconds.
  4. Try booting into Safe Mode (interrupt startup 2–3 times, then Advanced options > Startup Settings > Safe Mode) to see if the login screen appears there with minimal drivers.
  5. If Safe Mode's login screen works fine, update your graphics driver once logged in, since it's the most common cause.
  6. Check and reseat your display cable if you also notice any flickering or intermittent signal issues around this stage.
  7. If Safe Mode also fails to show a login screen, run Startup Repair and 'sfc /scannow' from the Windows Recovery Environment to address possible system file corruption.

Tools and parts

  • Bootable Windows recovery USB drive

When to call a pro

If Safe Mode also fails to display a login screen and repair tools don't help, a technician can perform a deeper repair install to restore the Windows shell components.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.