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When to Do It:

  • When a device connected to a SCSI, ATA, USB, FireWire, or ADB port does not mount or does not function as expected. This includes fixed-format disk drives, removable media cartridge drives, CD-ROM drives, printers and more.

  • When a system crash or freeze occurs as a result of accessing an externally connected device. For example, when trying to open any or almost any file on an external drive or CD-ROM drive results in a system crash. Or if a freeze occurs when trying to access a scanner.

  • When you cannot start up your Macintosh because a Sad Mac appears.

  • When you cannot start up your Macintosh because a system error occurs, particularly if the error occurs immediately after the Welcome to Macintosh message appears.

  • When you lose access to external devices connected to your Macintosh. For example, if SCSI devices are not recognized by a SCSI utility, or if a USB printer is not listed in the Chooser.

  • Whenever problems develop immediately after you add, remove, or rearrange the order of these devices, especially SCSI or ATA devices.

  • If the Mac does not respond to mouse and/or keyboard input.

  • When multiple copies of the disk icon of a SCSI disk device appear scattered over the desktop.

  • If you get any of a variety of error messages that indicate a problem with peripheral devices. USB device error messages are especially common.

  • Any other time a peripheral device is a likely suspect as the cause of a problem.


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