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How to Fix Windows 11 Memory Diagnostic Tool Stuck: Step-by-Step Solutions

Windows 11 Memory Diagnostic Tool is a handy utility designed to check your computer’s RAM for errors. Sometimes, the tool may get stuck during the scanning process, causing frustration and confusion.

This article will guide you through simple and clear steps to fix the Memory Diagnostic Tool when it stops responding.

Each step is explained in a way that anyone can follow, regardless of technical experience.

By the end, you’ll know how to troubleshoot this problem effectively and get your PC running smoothly again.

Quick Note: Before You Begin

Before jumping into fixes, make sure your computer meets a few basic conditions:

  • Save your work: Some steps may require restarting your PC, so save any open files.
  • Close unnecessary programs: Running apps can interfere with diagnostics.
  • Check for Windows updates: Sometimes updates fix system tool bugs.
  • Ensure you have administrator access: Some steps need admin rights to execute properly.

Step 1: Wait Patiently and Avoid Interruptions

Sometimes the Memory Diagnostic Tool appears stuck, but it’s actually running in the background. The time it takes depends on your RAM size and speed.

Why this matters: Interrupting the tool too early may cause incomplete tests or system instability.

Tip: Wait at least 30 minutes before considering the tool is truly stuck.

Step 2: Restart Your Computer and Run the Tool Again

If the tool remains stuck, perform a simple restart. This can clear temporary glitches that might have caused the hang.

  1. Press Ctrl + Alt + Delete and select Restart.
  2. Once restarted, open the Memory Diagnostic Tool again by typing mdsched.exe in the Start menu search.
  3. Choose Restart now and check for problems.

This clean restart often fixes minor software hiccups.

Step 3: Run the Memory Diagnostic Tool in Safe Mode

Running the tool in Safe Mode can help avoid interference from third-party software or drivers.

  1. Press Windows + R, type msconfig, and press Enter.
  2. Go to the Boot tab and check Safe boot, then select Minimal.
  3. Click Apply and OK, then restart your PC.
  4. Once in Safe Mode, run the Memory Diagnostic Tool again.
  5. After testing, repeat steps 1-3 to uncheck Safe boot and return to normal mode.

Safe Mode limits running processes, reducing the chance of conflicts.

Step 4: Check Your Hard Drive for Errors

Sometimes, disk errors can cause system tools to freeze. Running a disk check can help.

  1. Open Command Prompt as administrator (search for cmd, right-click, and select “Run as administrator”).
  2. Type chkdsk /f /r and press Enter.
  3. You may be asked to schedule the check on the next restart — type Y and press Enter.
  4. Restart your computer to start the disk check.

This process repairs disk errors that might interfere with memory diagnostics.

Step 5: Update Your Device Drivers

Outdated or corrupt drivers, especially for your motherboard or RAM controller, can cause diagnostic tools to freeze.

  1. Press Windows + X and select Device Manager.
  2. Expand Memory technology devices or related categories.
  3. Right-click each device and choose Update driver.
  4. Choose Search automatically for updated driver software and follow prompts.
  5. Restart your PC after updating drivers.

Keeping drivers updated ensures better compatibility with system tools.

Step 6: Use Alternative Memory Testing Tools

If the built-in tool still fails, you can try third-party memory testing software like MemTest86 or PassMark MemTest.

These programs can be run from USB drives and often provide more detailed memory diagnostics.

Why use alternatives? They may bypass Windows-specific issues causing the built-in tool to hang.

FAQs

Why does the Memory Diagnostic Tool get stuck?

The tool may hang due to interference from other software, hardware issues, outdated drivers, or disk errors.

Is it safe to force restart while the tool is running?

It’s best to avoid force restarting during a test to prevent data loss or corruption. If it’s stuck for hours, a restart is acceptable.

How long should the memory test take?

Depending on your RAM size, it may take from 15 minutes to over an hour.

Can I run the tool without restarting my PC?

No. The Memory Diagnostic Tool requires a reboot to test memory outside of the Windows environment.

Will fixing the diagnostic tool resolve all memory problems?

Fixing the tool helps you identify RAM issues, but if problems persist, hardware replacement might be necessary.

When Nothing Works

If all steps fail and the Memory Diagnostic Tool remains stuck, consider these final options:

  • Contact Microsoft Support: Visit Microsoft’s official support for personalized help.
  • Check your RAM physically: Turn off your PC, unplug it, and reseat or replace your RAM modules if comfortable doing so.
  • Use System Restore: Roll back your system to a previous state when the tool worked correctly.
  • Perform a clean Windows reinstall: As a last resort, reinstall Windows to fix deep system issues.

Conclusion

The Windows 11 Memory Diagnostic Tool is an essential utility for checking RAM health, but it can sometimes get stuck. By patiently waiting, restarting, running the tool in Safe Mode, checking your hard drive, updating drivers, or trying alternative tools, you can resolve most issues.

If all else fails, seeking professional support or hardware checks may be necessary. Following these clear and basic steps will help you identify and fix memory problems effectively.

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