![]() Thus, the most likely explanation is a damaged Install DVD (not completely shot, obviously, since you can run the OS X installer from it, but likely damage to the region of the dvd with the bootable OS). It tries for a while, then defaults to the internal HDD which boots. The alternating finder face/? mark means the Mac cannot find a valid OS where it is looking, and it's looking on the disc in the optical drive in this case. The only method you have not tried is inserting the Install DVD 1, then going to System Preferences > Startup Disk and selecting the DVD, then clicking Restart. Also, be sure you are using Install DVD 1 (not 2, etc.) - if so, this should work with both of the methods you are describing. ![]() I will assume that you are trying to boot from the internal optical drive. ![]() However, youĬan boot from an external FireWire hard disk. As you now know, booting from an external USB is not possible for you.
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