Computer Shuts Down Randomly? Overheating Diagnosis, Fix & Prevention Guide
Category: Hardware | Date: 2026-06-25
Computer randomly shuts down in summer, case burning hot? CPU overheating is one of the most common office hardware failures. Learn how to check temps, clean fans, and replace thermal paste.
Article Summary
Last updated: June 2026 | Written by IT SUPPORTKING Technical Team Why Computers Randomly Shut Down In Hong Kong's hot, humid summers, computers often shut down without warning. The cause is almost always CPU overheating — modern processors have built-in thermal protection that cuts power when core temps exceed 95-105°C. The five main culprits: dust-clogged fans, dried thermal paste, poor ventilation, background CPU hogs, and failing fans. Step 1: Check Temperatures Download Core Temp or HWMonitor. Healthy ranges: Idle 30-45°C, office use 45-65°C, heavy load 65-85°C. Sustained 90°C+ needs immediate action. Fix 1: Clean Fans and Heatsinks For desktops: power off, unplug, open the case. Use a soft brush and compressed air to clean the CPU cooler, GPU, and case fans. Hold fan blades still whi...
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