Safe Mode is a basic diagnostic mode for your operating system that starts the computer without most of its drivers and software.

Holding down the shift key while turning a Mac on will boot it into Safe Mode. Here's how to start a Mac in Safe Mode and use it to diagnose issues.

Turn off your system. Remove the power cord and disconnect all the peripherals. Disconnect the charger if it is a laptop. Press and hold the power button for up to 30 seconds. Turn on your system.

ZDNET's key takeaways The Black Screen of Death is incredibly annoying, but often easily diagnosed.The most common culprits are outdated software or faulty drivers. With a few quick fixes and basic ...