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After replacing the battery using the guide here, my MacBook doesn’t make any sound connecting to the power and also won‘t turn on when pressing the power button. Any ideas for what could cause this?? Any help greatly appreciated :) I followed the steps closely and also had the feeling that everything went ok. Thanks in advance!!

Review this Apple T/N to make sure your MagSafe is the correct one and in good shape Apple Portables: Troubleshooting MagSafe adapters. Beyond that, what is the color of the MagSafe plug?