To enter Safe Mode, you must first disable these options. If you have Apple's FileVault disk encryption technology enabled, or if you have a firmware password set on your system, then the computer will not boot to Safe Mode. Some security settings in OS X may contribute to the inability to boot to Safe Mode. FileVault in OS X 10.7 "Lion" or later will prevent booting to Safe Mode. The inability to boot into Safe Mode may happen because the system is configured with encryption or other security settings that prevent booting to such modes, because of nuances with how wireless keyboards pass boot arguments to the system, or because of errors in the file system.
To get into Safe Mode you simply restart your Mac with the Shift key held however, in some cases this will not work and the computer may simply boot normally or experience a problem and hang without booting at all. I am looking for professional advice on what might be the issue so I can find out what to replace or do to fix it.If your Mac is experiencing problems running, one step for determining the problem is to boot the system into Safe Mode, which is a limited environment that only loads Apple-provided software for basic functionality. Please note, I have tried every suggestion I could find on the Internet. I think the problem is either the battery or the charger (the charger is kinda beat up, and a replacement I got online, but has been working for about 6 months without too many issues besides overheating). The light on the charger is orange, as if to indicate that it is charging. Since then I have had it charging to be turned on every half hour or so with 0% battery, then promptly shutting off again after a couple minutes. However, in under 10 minutes (of minimal use, no large programs open, screen brightness at minimum), the laptop shut off again. I fixed the initial problem by resetting the SMC, and the charger turned orange and the mac turned on with about 4% battery and said it was charging. The charger light was green and would not charge. So my Macbook Pro has been plugged in all day and after about 6-8 hours of being on it shut down, telling me the battery was dead.
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