Sometimes dust and debris also disrupt the connection. Make sure that the charging point is plugged in properly. So, if Mac isn't starting up when it is on battery power, plug in the charger. The most plausible reason would be that battery drained from your system and as a result, Mac laptop won't turn on. Just follow them in the same order and one of them will work out for you. Take a look at the solution and try them to see which one fixes Mac without any hassle. Even if you can't figure out the exact reasons, trying out the common solutions won't harm Mac. It is basically the hardware issues that lead to MacBook pro not starting issue. Broken hard disk permissions are conflicting with user accounts.The corrupted cache of critical system files.Incompatible login items related to application interrupting the Mac boot process.Broken application affecting the system startup.It's a display issue instead of a power problem.There isn't enough battery left on the Mac.If MacBook won't start or boot, the main reasons might be: How to Recover Data from MacBook That Won't Startīefore we step down to the Solutions, you must understand why the problem arises in MacBook.Solution 10: Reboot Mac into Recovery Mode.Solution 9: Start Mac Using Another Account.Solution 7: Boot MacBook Pro in Safe Mode.Solution 6: Reset the System Management Controller (SMC).

2010 macbook pro 3 beeps wont power up