Of course if you happen to have a replacement battery then you can typically just replace the missing battery with a working battery and the MacBook Pro will boot, but that is not always an option. How to Boot MacBook Pro with No Battery Installed So let’s discuss how to boot an older MacBook Pro when there is no battery present at all. We are assuming the MacBook Pro has no battery installed in the computer, meaning there physically is no battery installed. In this case, you can force the MacBook Pro to boot by following these steps: Then, when attempting to boot the Mac or pressing the start button, nothing happens. Hold down the Power button for 10 seconds and continue to hold it down.

While still holding the Power button, connect the MagSafe power cable to the MacBook Pro and continue to hold the Power button for another 10 seconds.Release the Power button, then press the Power button as usual to power on the computer and boot the Mac.

When the MacBook Pro does boot, the fans will be blasting at full speed for the entire time you are using the Mac ( resetting SMC or PRAM does not stop the fans running, only replacing the battery will).Īlso it appears that the MacBook Pro will reduce its own clock speed in this situation, thereby reducing performance.

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