Mac OS X 
MacBook Pro (15-inch, Mid 2010) intermittent black screen or loss of video Quality Program has ended
The eligibility period for the MacBook Pro (15-inch, Mid 2010) intermittent black screen or loss of video Quality Program has ended.
Mac App Store: "An unknown error occurred (100)" when purchasing
When attempting to purchase an app, an alert might appear indicating the app couldn’t be purchased, as well as “An unknown error occurred (100)”.
Troubleshooting the Mac App Store
While using the Mac App Store on your Mac, you may encounter issues which you can troubleshoot and resolve yourself, or which have simple workarounds.
If you can mount a file server using AFP but not SMB
SMB 3 security requirements might prevent you from mounting a share point using SMB.
Uninstall or disable Apple Remote Desktop
Sometimes you may need to uninstall or disable Apple Remote Desktop for maintenance tasks.
Apple Remote Desktop: Configuring remotely via command line (kickstart)
Apple Remote Desktop includes the “kickstart” command line utility. It allows you to install, uninstall, activate, configure, and restart components of Apple Remote Desktop without restarting the computer.
OS X Mavericks: Apple Remote Desktop 3 stops responding
Learn what to do if Apple Remote Desktop 3 stops responding.
