Why Is My Laptop Overheating? Causes, Warning Signs, and Solutions

A laptop that runs hot is a laptop at risk. Learn the warning signs of overheating, the common causes, and how to cool things down before serious damage occurs.

Category: Troubleshooting | Read time: 3 min | By Midland Computers

Overheating Is One of the Leading Causes of Laptop Failure

A laptop that runs excessively hot is not just uncomfortable to use — it is actively damaging your hardware. Sustained high temperatures degrade components over time, reduce performance, and can cause sudden shutdowns or even permanent failure.

Warning Signs Your Laptop Is Overheating

  • The bottom of the laptop is too hot to comfortably hold
  • The fan runs at maximum speed constantly, even during light tasks
  • The laptop slows down significantly during use (thermal throttling)
  • Unexpected shutdowns or freezes, particularly during demanding tasks
  • Visible CPU temperatures above 90°C when using a system monitoring tool

    • Common Causes of Laptop Overheating

    1. Dust and Blocked Vents

    This is the most common cause by far. Over time, dust accumulates inside the laptop and clogs the cooling fans and heat sink fins. Even a thin layer of dust acts as insulation and dramatically reduces cooling efficiency.

    2. Dried-Out Thermal Paste

    The thermal paste between the CPU/GPU and the heat sink dries out and becomes ineffective after 3-5 years. This is a major contributor to overheating in older laptops and is often ignored.

    3. Soft Surfaces

    Using your laptop on a bed, pillow, or carpet blocks the vents on the bottom of the machine. Always use on a hard, flat surface.

    4. Background Processes

    Malware or runaway software processes can push your CPU to 100% usage constantly, generating excessive heat. Check Task Manager for any processes using abnormally high CPU.

    5. Failing Fan

    If the cooling fan itself is faulty, broken, or seized, the laptop has no way to dissipate heat effectively.

    What You Can Do Right Now

  • Clean the external vents with compressed air (available from hardware stores)
  • Elevate the laptop with a stand or cooling pad to improve airflow
  • Close unnecessary browser tabs and background applications
  • Check Task Manager for runaway processes

    • When to See a Technician

    If compressed air and better airflow do not solve the problem, the laptop needs a professional internal clean and possibly thermal paste replacement — both of which require disassembly.

    At Midland Computers, we perform thorough [laptop repairs and servicing in Midland](/services/computer-repairs-midland), including internal cleaning, fan replacement, and thermal paste reapplication. This service typically restores laptops to running cool and quiet again.

    Do not wait until your laptop shuts down during important work. [Book a service appointment](/book-repair) or [contact us](/contact) — our technicians are some of the most experienced in the Perth region.