Reader Simon Hansen finds his Mac slow to do his bidding. He writes: My Mac has been running very slowly lately and I wanted to see how much faster it would be if I disabled its startup items. But ...

Safe mode is an important troubleshooting tool. It boots the OS in such a way that it uses the bare minimum files and apps to start and run. This can help you isolate issues, figure out where problems ...

Clues to the causes of Mac startup problems can be found by analyzing when in the boot process the system fails. Problems may be related to the power supply, battery, hard drive, logic board, OS ...