Also, use your Mac on a stable surface or consider using a laptop stand. Mac tends to heat up in the absence of external airflow. Apparently, the machine refused to start due to the high-temperature fail-safe mechanism.Īvoid keeping your Mac on pillows, sofas, or places with limited air circulation. Thankfully, the laptop started working after a while. I was in for a rude shock my MacBook Air refused to start and was as hot as fire. One sunny afternoon I had left my Mac in my car. That said, none of the tools measure case temperature. It shows the internal temperature and notifies when your Mac battery is overheating. I suggest using free tools like CoconutBattery. The fan will run at high speeds for a longer duration on the flip side. Since Mac is overheating, the fan does its best to dissipate heat. Overheating is a probable cause of loud fan noise. Please note that fans run for a relatively long time when Spotlight indexes your hard drive. Ideally, the fan noise should die out in minutes if not, proceed to the next step. Check apps with the highest CPU usage, and close the apps you don’t need.Open Activity Monitor → Select CPU Column.Identify resource-hogging apps using Activity Monitor. Most importantly, you can close other apps using graphic-intensive apps like Lightroom CS5 or Final Cut. Furthermore, scores of open browser tabs add to the problem. ![]() Use Activity Monitor to check CPU usageĬhrome browser is notorious for sapping computing resources.
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