Top 5 Free Tools to Diagnose PC Problems Before Going to a Technician
Why Diagnose First?
Technicians are great, but if the problem is something simple—like a software bug, overheating, or a driver issue—you might be able to fix it yourself in under 30 minutes. Self-diagnosis tools can:
- Save you time and money
- Prevent unnecessary hardware replacements
- Give you knowledge to avoid future issues
- Help explain the issue better if you do need tech help
Now let’s break down the top 5 free PC diagnostic tools you should try before booking a repair.
1. Windows Memory Diagnostic Tool
If your PC randomly restarts, freezes, or crashes, faulty RAM could be the culprit. This built-in Windows tool checks your memory for errors.
How to Use:
- Press Windows + R and type
mdsched.exe - Choose “Restart now and check for problems”
- Let your computer restart and scan
It will report if RAM issues are detected. If yes, you’ll know it’s time to replace a memory stick.
Why It’s Great:
- No downloads needed—it’s already in Windows
- Simple interface
- Helps avoid buying new RAM blindly
2. CrystalDiskInfo (For Hard Drive & SSD Health)
If your PC is sluggish, freezing, or has trouble booting, your drive might be failing. CrystalDiskInfo checks your HDD/SSD’s SMART health data.
- Platform: Windows
- Download: Official Site
What It Shows:
- Drive temperature
- Health status (Good / Caution / Bad)
- Power-on hours and error rates
If the health says “Caution” or “Bad,” back up your data immediately!
AI Tip:
Prompt: "My CrystalDiskInfo shows Reallocated Sectors Count is over 100. What does this mean and should I replace my drive?"
3. HWiNFO (Hardware Overview + Temperature Monitor)
Overheating is one of the most common PC killers. HWiNFO is a powerful tool that shows you real-time system temps, voltages, fan speeds, and more.
- Platform: Windows
- Download: Official Site
What to Look For:
- CPU temps over 90°C? Likely overheating
- GPU usage at 100% when idle? Malware or software bug
- Low fan RPM? Cooling problem
Knowing this can help you fix issues with thermal paste, fans, or dust buildup before calling anyone.
Bonus:
It also shows hardware model numbers if you plan to upgrade later.
4. WhoCrashed (Analyze Blue Screens & System Crashes)
Sick of random blue screens (BSOD)? WhoCrashed analyzes crash dump files and gives human-readable explanations of what caused it—driver issue, RAM error, etc.
- Platform: Windows
- Download: Official Site
What It Does:
- Reads dump files and points to the cause
- Gives recommendations (e.g., update or remove a driver)
- Highlights frequent offenders
You’ll know whether it’s your graphics driver or RAM acting up—without guessing.
5. Malwarebytes Free (Malware & PUP Scanner)
If your computer is slow, overheating, or showing weird popups, it may be malware. Malwarebytes Free is one of the best free anti-malware tools out there.
- Platform: Windows, macOS
- Download: Official Site
Free Version Includes:
- Malware and spyware scan
- PUP (Potentially Unwanted Programs) removal
- Fast system cleanup
Many “tech problems” are actually caused by hidden malware. This tool eliminates them in a few clicks.
