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How to Fix the Blue Screen of Death (BSOD)

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PC Technician
WindowsBSODTroubleshooting

What is a BSOD?

The Blue Screen of Death (BSOD) is a stop error screen displayed by Windows upon encountering a critical system error. It means Windows can no longer operate safely and must restart to prevent data corruption.

Common Causes

  • Incompatible or outdated device drivers (especially GPU or network drivers).
  • Corrupted system files or registry entries.
  • Failing hardware (RAM, hard drive, or power supply).
  • Overheating.

The Fix: Step-by-Step

Step 1: Note the Error Code

When the blue screen appears, there is usually a stop code at the bottom (e.g., IRQL_NOT_LESS_OR_EQUAL or VIDEO_TDR_FAILURE). Write this down—it's your biggest clue.

Step 2: Boot into Safe Mode

If your PC crashes immediately upon startup, you need to enter Safe Mode:

  1. Turn off your PC.
  2. Turn it on, and as soon as the Windows logo appears, hold the power button to hard power it off. Repeat this 3 times.
  3. On the 4th boot, Windows will enter Automatic Repair. Choose Advanced Options > Troubleshoot > Advanced Options > Startup Settings > Restart.
  4. Press 4 or F4 to start in Safe Mode.

Step 3: Update Drivers

If you just installed a new piece of hardware or updated a driver before the crash, roll it back or update it.

  1. Right-click the Start button and select Device Manager.
  2. Look for any yellow exclamation marks. Right-click and choose Update driver or Uninstall device.

Step 4: Run System File Checker (SFC)

Corrupted OS files can trigger BSODs. Let's fix them:

  1. Open Command Prompt as Administrator (Win + X, then Command Prompt (Admin) or Terminal (Admin)).
  2. Type sfc /scannow and press Enter. Let the verification complete.

Step 5: Check Your RAM

Faulty memory is a leading cause of random BSODs.

  1. Press Win + R, type mdsched.exe, and press Enter.
  2. Choose Restart now and check for problems.
  3. Windows will reboot and test your RAM.

Still crashing?

If you've tried these steps and the crashes persist, it could be a hardware failure. Consider testing your hard drive health or checking your system temperatures.