An Intel-based Mac may not be able to start up after attempting to install an unsupported version of Microsoft Windows XP via Boot Camp. In this situation, your Intel-based Mac may not be able to start from Mac OS X even if you hold the Option key during startup, and the hard disk may not be accessible in FireWire Target Disk Mode.

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Intel-based Mac: Startup issues after using unsupported version of Windows installer via Boot Camp

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