Happy Mac

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A Happy Mac is the normal bootup (startup) icon of an Apple Macintosh computer running older versions of the Mac OS operating system. On later New World ROM hardware it was modified into a folder icon bearing the Mac OS logo (itself based on the original Happy Mac); it was removed with the introduction of Mac OS X v10.2, which replaced it with a large grey Apple logo. The Happy Mac was designed by Susan Kare.

When a Macintosh boots, it makes a startup chime and the screen turns gray. After a few seconds, a Happy Mac icon will appear, followed by the splash screen of whatever version of the Mac OS that is installed on the computer. The Happy Mac indicates that booting has successfully begun, whereas a Sad Mac (along with a "Chimes of Death" melody) indicates a hardware problem.

On early Macs that had no internal hard drive, the computer would boot up to a point where it would need to load the operating system from a floppy disk. Until the user inserted the correct disk, the Mac would display a floppy icon with a blinking question mark. In later Macs, a folder icon with a question mark that repeatedly changes to the Finder icon is shown if a valid System Folder cannot be found.