How to Fix Computer Shuts Down Randomly on Windows
PC turning off by itself without warning, no blue screen, just sudden power loss? Fix random shutdown issues caused by overheating, PSU problems, or power settings.
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Main Troubleshooting Guide
How to Fix Computer Freezing and Hanging →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Computer turns off suddenly with no warning or blue screen
- •PC shuts down during gaming or heavy workload
- •Computer powers off and immediately restarts
- •Shutdown happens at random intervals
- •PC turns off after a specific duration of use
- •Computer shuts down when moved (laptop) or bumped (desktop)
Common Causes
- ⚠CPU or GPU overheating triggering thermal shutdown
- ⚠Power supply unit (PSU) failing or insufficient wattage
- ⚠RAM fault causing instant crash
- ⚠Power settings configured for aggressive shutdown
- ⚠Loose power cable or failing battery (laptop)
- ⚠Motherboard power delivery issue
Solutions
Solution 1: Check Temperatures
- 1Download HWMonitor or Core Temp (free)
- 2Monitor CPU temperature during normal use
- 3Normal: 40-70°C idle to load; concerning: 90°C+
- 4If overheating: clean dust from fans and heatsinks
- 5Reapply thermal paste if CPU temps exceed 90°C under load
- 6Ensure all case fans are spinning and vents aren't blocked
Solution 2: Check Power Supply
- 1If shutdowns happen under load (gaming): PSU may be insufficient
- 2Check your PSU wattage vs your GPU's power requirement
- 3A failing PSU can cause shutdowns even if wattage is adequate
- 4Listen for clicking sounds from the PSU
- 5Test with a known-good PSU if available
- 6For laptops: try a different charger — a failing charger causes shutdowns on battery
Solution 3: Disable Automatic Restart on Failure
- 1The shutdown might actually be a BSOD with auto-restart enabled
- 2Right-click This PC > Properties > Advanced system settings
- 3Under Startup and Recovery: click Settings
- 4UNCHECK "Automatically restart" under System failure
- 5Click OK — next time it crashes you'll see the blue screen instead of instant restart
- 6Check Event Viewer > Windows Logs > System for "Critical" events at shutdown time
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