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started running at 210 degrees why

started getting very hot (210 degrees) while performing same task that would normally raise it to 170-180. what could cause the sudden increase?

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Most likely your HD SATA cable is breaking down so it's fighting though a CRC battle between the drive & CPU every time you open or save a file.

Here is the IFIXIT guide: MacBook Pro 13" Unibody Early 2011 Hard Drive Cable Replacement and you want to use the newer version of the cable: MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable - Apple P/N 923-0104. You'll want to put some tape down on the upper case where the cable rests as the ruff surface of the aluminum often wears the cable.

I would strongly recommend after you install the new cable to do a full backup and then wipe your drive and reinstall the OS and restore your backup to make sure you don't have any corrupted files.

crwdns2886500:0MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cablecrwdne2886500:0

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MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable

$34.99

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Robert, I would also follow the ifixit guide tear down to remove the black fans and use a can of air to make sure the vents are clear of dust.

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Yes! I did gloss over that.

Dusting out a system should also be done. Don't for get the heatsink fins.

Thanks! @avanteguarde

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robert owen crwdns2893898:0crwdne2893898:0
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