These images later evolved into iPods, such as the "Sad iPod" image. The successful startup message is called "Happy Mac", which is a picture of an 1984-era Macintosh with a smiley face on its display screen. Another grey screen appears with a successful startup message. An example is a question mark appears on a folder for several seconds, alternating with the Finder logo and finishing with the Finder Logo. Occasionally startup errors occur, some of which can be resolved by themselves. Common error messages include a Question Mark on top of either a folder or a diskette. The first thing to appear is a movable mouse arrow. The loading of these early OSs involve several grey screens, depending on the type of hardware installed. When one is turned on, a chime sounds, indicating successful hardware detection. The earlier OSs were very simple and used a monochrome color scheme.
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Mac OS was introduced in 1984, after the Apple Lisa project.