For drives that can't boot using the C key, try cmd-opt-shift-delete as explained above. C: Boot from Apple-brand CD-ROM drive.The optional number allows for booting from a specific SCSI ID. cmd-opt-shift-delete-(#): Boot from a SCSI device on the SCSI bus other than the disk selected in the Startup Disk control panel.cmd-opt-T-V: Force 660AV or 840AV to use TV connected to the AV jacks as the monitor.cmd-opt-A-V: Reset AV monitor and force it to be recognised as such.Boots from copy of System 6.0.3 in the ROMs. cmd-opt-X-O: Boot from ROM (Mac Classic only).Date, time, and AppleTalk settings will be lost. The following should be held down when the computer is first powered up to take effect: Note: command (cmd) is the same as the Apple key option (opt) is the same as the alt key. Certain keys will cause various actions to be taken. This document is loosely based on Charles Poynton's startup key combinations document which has since disappeared from his web site.Ī Mac does several checks when it is first powered on one of the first things it does is scan the keyboard bus (ADB) for any signals. Startup Key Combinations - the pickle's Low-End Mac FAQ Macintosh Startup Key Combinations
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