Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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fan is fast, and Mac os slow

Apple Hardware test

4sns/1/C0000008: TP0P--124

and defragment my disk (ssd hybrid hard at 7200 rpm).

and reset the SMC (System Management Controller)

Reinstall my Os (Maverick)

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You have a blown power sensor (tpop) the rest of the error details facts about the error (the last number tells how much out of range it is),

Any sensor faiure makes the fans run at full speed by default in order to keep from cooking the CPU. With the fans using up all that energy your battery life will be shortened.

The sensor must be repaired/replaced (not a DIY sort of project) OR the logic board can be replaced (an advanced DIY project) not the first one I'd start with - you basically have to completely dismantle then reassemble the entire laptop.

If this answer is acceptable please remember to return and mark it.

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