How To Fix Windows Restarting Without Warning

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If your Windows computer is restarting without warning, there are several potential causes and corresponding solutions you can explore. Based on the latest information from various sources, here’s a guide:

Scan for Malware

Malicious software can cause unexpected system behavior, including random restarts. It’s crucial to regularly scan your system for malware.

1. Using Windows Security:
   • Press the Windows key and search for Windows Security.
   • Open Windows Security and navigate to Virus & Threat Protection.
   • Click on Scan options and select Full Scan for a comprehensive check.
   • Hit Scan now to start the scanning process.
2. Using Third-Party Antivirus Software:
   • Open your preferred antivirus program.
   • Look for the option to perform a Full or Deep Scan.
   • Initiate the scan and wait for it to complete.
   • Follow the instructions to remove any detected malware.

Check CPU Temperatures

Overheating can cause computers to restart unexpectedly. Monitoring CPU temperature is essential, especially during intensive tasks.

1. Using BIOS:
   • Restart your PC and enter the BIOS setup (usually by pressing a key like F2, Del, or Esc during startup).
   • Navigate to a section like Hardware Monitor or System Health to find the CPU temperature readings.
2. Using Third-Party Software:
   • Download and install a reliable hardware monitoring tool (like HWMonitor, SpeedFan, or Core Temp).
   • Run the software to check current CPU temperatures and compare them against safe operating ranges.

Memory Problems

Defective or failing RAM can cause your computer to restart randomly. Windows includes a Memory Diagnostic tool to check for memory problems.

1. Running Windows Memory Diagnostic:
   • Press the Windows key and type Windows Memory Diagnostic, then press Enter.
   • Choose to either restart immediately and check for problems or check the next time you start your PC.
   • Upon restart, the tool will automatically start testing the RAM and will report any issues found.
2. Checking RAM Physically:
   • Shut down your computer and open your system unit.
   • Check for any physical signs of damage on the RAM sticks.
   • Ensure that the RAM is properly seated in its slot.
   • If you have multiple RAM sticks, try booting with one stick at a time to identify a faulty module.

Disable Fast Startup

Fast Startup in Windows 11 might lead to restart issues. Disabling it could improve system stability.

1. Disabling Fast Startup:
   • Press the Windows key + R, type powercfg.cpl, and hit Enter to open Power Options.
   • Click on Choose what the power buttons do.
   • Select Change settings that are currently unavailable.
   • Uncheck Turn on fast startup (recommended) and click Save changes.

Run a CHKDSK Scan

Hard drive issues can cause your system to restart. Running CHKDSK helps identify and fix hard drive errors.

1. Performing a CHKDSK Scan:
   • Open Command Prompt with admin rights (Right-click on Start button > Command Prompt (Admin)).
   • Type chkdsk /f /r and press Enter. (Replace /f /r with appropriate flags based on your needs).
   • Restart your computer to initiate the scan. The scan will run before the system boots into Windows.

Update Graphics Card Driver

Outdated or corrupted graphics drivers can lead to system instability and restarts, especially during graphics-intensive tasks.

1. Updating Drivers Manually:
   • Open Device Manager (Right-click on Start button > Device Manager).
   • Expand Display adapters, right-click on your graphics card and select Update driver.
   • Choose Search automatically for updated driver software and follow the prompts.
2. Using Dedicated Software:
   • Download and install a driver update tool (like Driver Easy or NVIDIA GeForce Experience).
   • Run the software to automatically detect and update your graphics drivers.

Update Windows 11 Drivers

Keeping your system drivers up-to-date is crucial for ensuring stability and performance. Outdated drivers can cause various issues, including unexpected restarts.

1. Updating via Windows Update:
   • Press Windows + I to open Settings.
   • Navigate to Update & Security > Windows Update.
   • Click on Check for updates and install any available driver updates.
2. Using Device Manager:
   • Right-click on the Start button and select Device Manager.
   • Go through each category and right-click on devices to check for updates.

Change Windows 11 Update Settings

Improper update settings can lead to system instability. Adjusting these settings can prevent unwanted restarts, especially those triggered by updates.

1. Modifying Update Settings:
   • Open Settings with Windows + I.
   • Navigate to Update & Security > Windows Update.
   • Adjust your active hours and restart options to prevent automatic restarts during work hours.

Address Hardware Issues

Hardware malfunctions are a common cause of unexpected restarts. Identifying and resolving these issues is crucial.

1. Inspecting and Replacing Hardware:
   • Check your power supply for any signs of failure or inadequate power output.
   • Examine your RAM sticks for any damage and test them individually.
   • Ensure your graphics card is properly seated and functioning.
   • Look for any signs of damage or wear on your motherboard and other components.
2. Seeking Professional Help:
   • If you’re unsure about diagnosing hardware, consider taking your PC to a professional.
   • Regular maintenance checks by professionals can help identify issues before they cause problems.

Software Conflicts

Incompatible or corrupted software, including device drivers and OS files, can cause your computer to restart unexpectedly.

1. Identifying and Resolving Conflicts:
   • Check for any recently installed software that might conflict with existing programs.
   • Use the System Configuration tool (msconfig) to perform a clean boot and identify problematic software.
   • Uninstall or update software that is causing conflicts.

Update Group Policies

Incorrect group policy settings, especially after an update or system change, can lead to unexpected system behavior, including restarts.

1. Adjusting Group Policies:
   • Open Command Prompt with admin rights.
   • Type gpupdate and press Enter to update your group policies.
   • Restart your computer to apply the changes.

Run System File Checker (SFC Scan)

The System File Checker is a tool in Windows that allows users to scan for and restore corruptions in Windows system files.

1. Conducting an SFC Scan:
   • Open Command Prompt as administrator.
   • Type sfc /scannow and hit Enter.
   • The tool will scan and fix any corrupted system files it finds.
   • Restart your computer after the scan is complete.

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