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I have suddenly started getting the error message and exactly the same time there is now a loud fan noise on the left side of my Mac Book Air. I have tried the safe boot mode I have seen on other threads and the message has gone but the noise is still there. Everything also now loads really slowly. I can't get a genius appointment until next week so if anyone can help that would be great!!

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Try resetting the SMC -- Apple recommends this if you are experiencing, among other things, fan and power issues, as well as slowdowns:

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