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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Apple hardware test without battery

I have got clear answer about 4SNS/1/40000000: ICOR - 21.926 error from previous answers but I have forgotten to say that I didn't have battery in my Mac during the test.

Do I need to make Apple Hardware Test with battery and connect my power supply or I can do it without battery? Does it any relation to result of test. Could be error 4SNS/1/40000000: ICOR - 21.926 as result testing without battery?

Thanks for answer

Answered! View the answer I have this problem too

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Can you give us some background here on whats happening.

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I forgot to say that the logic board on this laptop was replaced few weeks ago. Because the previous one was completely dead. I think that the replaced used logic board has errors.

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When I run Apple Hardware Test with battery there wasn't any errors. Thanks a lot for advise!

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You may want to run this app to see whats happening with your battery: coconutBattery. Paste a screenshot here so we can see.

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I would definitely run the test with BOTH the battery and the power cord inserted.

Since your specific error code points towards an issue with current, having the battery in may alter the sensor result.

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greytl will be eternally grateful.
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