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Readers ask about the power usage of memory upgrades, and more.
If your system hangs when going into Safe Mode, or will not load into Safe Mode at all, there are a couple of things you can do to fix the situation.
If you have a Bluetooth keyboard, OS X may ignore keystrokes at startup for booting into Safe mode and other optional boot environments.
A quick PRAM reset or settings change may help a stubborn MacBook that refuses to enter clamshell mode.
If you are considering purchasing a used Mac, here are some ways to find out if its hardware is running properly.
In Mac systems prior to 2011, you can uncover the Mac's firmware password using the Calculator's ability to manipulate binary numbers.
Apple supplies various alternate boot modes for OS X, but sometimes systems get stuck in them.
Safe Mode in OS X is a great troubleshooting option, but on rare occasions, a system might always boot to Safe Mode.
The OS X boot arguments are useful for troubleshooting problems with system startup and how the system behaves when running.
If you always see a gray progress bar at start-up when booting OS X, there are a few things you can do to correct the situation.