Safe Mode boots Windows with only the essential drivers and services running — the classic first troubleshooting step when a normal boot fails or a driver is causing instability.
# From a running Windows session
msconfig
# Boot tab > Boot options > Safe boot > Minimal, then restart
# Or force it via bcdedit for the next boot only
bcdedit /set {current} safeboot minimal
# Remember to remove it afterward:
bcdedit /deletevalue {current} safeboot
# From a black/blue screen: hold Shift while clicking Restart,
# then Troubleshoot > Advanced options > Startup Settings > Restart > press 4
The Three Variants
- Safe Mode — minimal drivers, no networking
- Safe Mode with Networking — same, plus network drivers, useful for downloading a fix or driver
- Safe Mode with Command Prompt — boots straight to a command line instead of the desktop, for the most stripped-down troubleshooting
If a problem disappears entirely in Safe Mode, it strongly points to a third-party driver or startup program as the cause, since those are exactly what Safe Mode excludes from loading.