HT204085: Frequently asked questions about iCloud Keychain
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Q: i had a macbook pro early 2011 and the lab was overheated and stop working i wanna ask if it is a hardware issue or a software iss ... i had a macbook pro early 2011 and the lab was overheated and stop working i wanna ask if it is a hardware issue or a software issue more
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Aug 14, 2015 3:54 AM in response to Dr.Hossamby dominic23,Runaway applications can shorten battery runtime,affect performances and increase heat and fan activity
Activity monitor
https://support.apple.com/en-us/HT203184
Reset SMC.
Choose the method for “On Mac notebooks with non-removable battery”.