Symptoms
- Windows logo appears and progresses somewhat before restarting
- Cycle repeats consistently on every attempt
- May happen after a specific point in loading, like after the dots have spun for a while
- No error message is visible before the restart
Likely causes
- CommonA driver crashing during the load process, triggering an automatic restartWindows can be configured to restart automatically after certain failures, hiding the actual error.
- CommonCorrupted system files interrupting the loading sequenceDamage partway through the startup files can cause a crash at a consistent point.
- PossibleRecently installed hardware causing instabilityNew RAM, drives, or expansion cards can destabilize the boot process.
- PossibleFailing power supply unable to sustain load through the full boot sequenceSome PSUs fail specifically under the higher power draw during startup.
- Less commonOverheating causing a protective restart mid-bootThough less common this early in startup, thermal issues can occasionally trigger this.
What to do
- Interrupt the cycle 2–3 times by holding the power button as the logo appears, to force Windows into the Recovery Environment.
- Under Advanced options > Startup Settings, choose to disable automatic restart on failure if that specific option is available, so you can actually read any error that appears.
- If a specific blue screen flashes before the restart, note its stop code for more targeted troubleshooting.
- Remove any recently added hardware and test booting with the original configuration.
- Run Startup Repair, then 'chkdsk C: /f' and 'sfc /scannow' from the Recovery Environment's Command Prompt.
- Try Safe Mode; if it loads successfully, a driver is likely responsible and can be updated or rolled back once in Safe Mode.
- If Safe Mode also fails at the same point, suspect hardware instability, and test with minimal components (one RAM stick, no extra cards) if you're comfortable doing so.
Tools and parts
- Bootable Windows recovery USB drive
When to call a pro
If the restart loop continues after Startup Repair, driver checks, and removing recently added hardware, a technician can run deeper diagnostics on RAM and the power supply.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.