If you´re trying to start up from the OS X install disk and it won´t load, here are some things to try (in order):

Make sure your firmware is current. You can get the latest upgrade at Apple

Disconnect peripheral devices, both USB and SCSI, except for your keyboard and mouse.

If you have any 3rd-party hardware add-ons (a SCSI adapter board, for instance, or even 3rd-party RAM) try removing them, one at a time. That SCSI adapter would be the prime suspect. You can replace them after the install.

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