How to Check to See If Your Computer Is Overheating

by Erin McManaway

Computers often have multiple fans to keep air circulating through the case and prevent overheating. The temperature of your computer’s processor, or CPU, is the most important consideration when determining if your computer is overheating. If a CPU is exposed to high temperatures, permanent damage could occur to the CPU and your motherboard. Many computers are equipped with case thermometers or other internal heat warnings to alert you when the system is running too hot.

Watch for unexplained computer reboots or blue screen errors. A computer will often shut down in attempt to protect an overheating processor.

Listen for warning beeps from within your computer’s case. Many computers have a built-in temperature alarm that will emit a beep or warning sound to alert you to overheating issues.

Listen to the sound of your computer’s CPU fan. When a computer is overheating, the fan usually blows harder for a longer time in an effort to increase airflow and lower the temperature. Likewise, listen for loud or unusual sounds that may indicate the fan is failing.

Download and install a free CPU temperature monitor program such as SpeedFan, Core Temp or CPU Thermometer if your computer does not have a built-in case thermometer. These programs display your CPU’s temperature as a number. The maximum temperature will vary depending on the type of CPU, but typically, 50 to 80 degrees C is the maximum your computer should reach. The temperature should be much cooler when the computer is sitting idle and not running programs.


  • Add more fans to your computer tower to increase airflow within the case.
  • Replace outdated thermal paste between the CPU and the cooling fan if needed.


  • Do not continue to run an overheating computer, as doing so may cause irreparable damage to the CPU or motherboard.
  • Do not attempt to repair a failing fan – replace it with a new one.

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