🔍 Physical Check (No Power Needed)

Plug in to test ports & charging — still before OS boots

🛠️ Quick Testing Tools (No Install)

🖱️ Mouse & Trackpad Tester → Open in new tab ⌨️ Keyboard Tester → Open in new tab 🖥️ Monitor Test (dead pixels, uniformity, etc.) → Open in new tab

🔌 Use these *before* buying to spot hardware issues.

🔥 Stress Test (CPU / GPU)

⚙️ Stress My GPU → CPU + GPU stress test (browser-based)

💡 Run for 10-15 min → Watch for crashes, lag, loud fans, or overheating.
⚠️ Save your work first – may freeze or lag your computer.

🧪 Advanced Hardware Tests (USB / Software)

🧠 Memory (RAM) Test

Use MemTest86 (free) – requires USB drive.
📌 Boot from USB → Let it run 1-2 full passes → Errors = bad RAM

💾 SSD / HDD Health

Use CrystalDiskInfo (Windows – portable).
📌 Check "Health Status" → Caution or Bad = replace drive
Also run CrystalDiskMark for speed test (compare to model specs).

🌡️ Heat & Sensors

Use HWInfo (free – sensors only mode).
📌 Run CPU/GPU stress test (above) → Watch max temps:
✅ Laptop: under 85-90°C | Desktop: under 75-80°C
🔥 Above 95°C = poor cooling / needs cleaning or repaste

⚡ Tip: Test on a used laptop before buying – these tools catch hidden failures.

🔋 Battery Health Check (Windows)

📊 Generate Battery Report

Open Command Prompt as Admin → Type:
powercfg /batteryreport
📌 Report saves to C:\Windows\System32\battery-report.html
→ Open in browser to see full details.

🔍 Key Things to Check
  • Cycle Count – Under 200 = good | 200-500 = okay | 500+ = worn
  • Design Capacity vs Full Charge Capacity
    → Compare numbers: Above 80% = healthy | Below 70% = replace soon
  • Battery History – Check for sudden drops in capacity over time
⚠️ Signs of a Boosted (Swollen) Battery
  • Laptop doesn't sit flat on a table (warped bottom panel)
  • Trackpad becomes hard to click or bulges upward
  • Visible bulge or separation on palm rest / bottom case
  • Battery report shows sudden capacity drop >20% in weeks

🚨 Swollen battery = fire risk. Stop using and replace immediately.

💡 On a used laptop, ask seller for battery report screenshot before buying.

🧠 RAM Details (No Tools Needed)

📊 Check Slots & Speed – Task Manager

Ctrl + Shift + Esc → Performance tab → Memory
📌 Look for:
✅ Slots used: X of Y (e.g., 2 of 4)
✅ Speed: DDR4-2666, DDR5-4800, etc.
✅ Form factor: SODIMM (laptop) or DIMM (desktop)

🖥️ Detailed Info – Command Prompt

Open Command Prompt (any user) → Type each command:
wmic memorychip get speed, capacity, manufacturer
wmic memorychip get devicelocator, capacity, speed
📌 Shows:
🔹 Manufacturer – Samsung, Hynix, Micron, Kingston, etc.
🔹 Speed (MHz) – All sticks should match or system runs slowest
🔹 Capacity (bytes) – Divide by 1,073,741,824 to get GB

🧪 What to Check While Testing
  • Compressed Memory: In Task Manager > Performance > Memory – if compressed size is high (>500 MB) with low total usage, may indicate memory pressure
  • All sticks match? Mixed speeds/manufacturers can cause system instability
  • Available slots: If only 1 of 2 slots used, you can upgrade later

💡 Pro tip: Run MemTest86 (from USB) to verify if RAM is error-free – don't skip this on used laptops!

🔧 On a used laptop, mismatched RAM sticks (different speeds/sizes) = seller likely replaced cheap parts.

🔐 BIOS, MDM & Windows Check

Avoid laptops with BIOS locks, MDM enrollment, or activation issues