Click on one of the HiDPI modes to enable it on your desired display. Click Scaled to reveal additional resolutions and you’ll see one or more options at the bottom of the list with “(HiDPI)” appended to their resolutions. Most users will likely have the “Default for Display” option checked, which is typically your display’s native resolution. Here you’ll see the familiar preference window where you can set your resolution and refresh rate. Next, reboot your Mac and, upon logging back in, head to System Preferences and click on Displays.Then press Return to execute the command and, because this is a “sudo” command, enter your admin password when prompted.$ sudo defaults write /Library/Preferences/ DisplayResolutionEnabled -bool true Fire up a new Terminal window and then copy and paste the following command:.Enter the new password (it does not appear on screen).Replace username by the name of the desired user account. Restart the Mac in Single User Mode and run the following commands: The procedure is slightly different for Mac OS X 10.4 ( Tiger). Reset Admin Password on Mac OS X 10.4 (Tiger) passwd /Users/ username password and press Enter. Type ls /Users and press Enter (this command list the all users accounts registered on the computer).Type launchctl load /System/Library/LaunchDaemons/ and press Enter.Boot your Mac while holding the Command + S keys down to access the Single User Mode.The below instructions also applies to Mac OS X 10.5 ( Leopard) and Mac OS X 10.6 ( Snow Leopard). Reset the admin password on Mac OS X 10.5 and 10.6 This method will be done through a system reboot in Single User Mode. This tutorial will teach you how to reset your admin password in Mac OS X 10.6 without the installation discs.

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