Q: Fan work very fast from start
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Sep 15, 2015 3:55 AMby OGELTHORPE,It sounds like you missed a connection or a faulty one. Maybe an Apple Hardware Test will provide a clue:
https://support.apple.com/en-us/HT201257
When you installed the replacement, was it from a Mac with the EXACT same model identifier?
Ciao.
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Sep 15, 2015 5:50 AMby Ciottolo,For steps:
SMC : i had do it but nothing change;
Apps: i cant' use activity monitor because the system is (actualy) very very slow and finder and other programs give problems to starts ( usualy no but after keyboard change yes ) and another strange things is that after some minutes the display turn off and turn on every two seconds at the end display turn off and i listen only fan to work intensly. Maybe overheating?.
AHT: i tried but AHT logo not appeare and start system normaly. Maybe because i have SSD with yosemite?
Thanks for help! I'm desperate !
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Sep 16, 2015 2:43 AMby OGELTHORPE,That is a temperature sensor fault. When one of them is tripped, the OSX revs up the fans as a default to deal with a possible heat increase. You will have to make an appointment at an Apple store genius bar in order to address this issue. You can provide technicians with the error code. There is no user solution.
Ciao.
