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MacBook cannot recognize battery

When I followed the battery replacement guide on this site exactly, I booted up my MacBook to see that my battery had an x through it with the no battery availible popping up when I scrolled over it. I (stupidly) left the computer on while I browsed for a solution. The whole time my charger showed a green light. Suddenly the computer turned off and hasn't been able to be turned back on since (about 2 weeks) despite switching to another battery and another charger. The charger still shows a green light, which means the battery is either fully charged or installed incorrectly. I don't understand how it can be installed incorrectly when the only part to put it into the computer is the plug in. Please someone help me, I have no idea how to fix it and have made multiple forums on here asking for help, to no avail.

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Was the X red or b lack?

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The x was black

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If Brandons answer fails, read the Q & A: Black x in the battery charge symbol?

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You're going to need to run an SMC reset. Instructions can be found here

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Wait, sorry... I just missed part of that.

You're going to want to remove the battery, and start the machine with JUST the power cord connected. Sometimes if there is a battery issue, as a safety measure, the computer will not power up with the battery in place.

Once you get the machine to boot, follow the directions in the link provided in the answer I posted.

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The machine doesn't start up, with or without the battery

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Jack Roche 将永远感激不已
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