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Hold down the Option key on the keyboard during startup. This invokes the Startup
Manager, which presents an iconic list of available system folders as well as a globe icon
for NetBoot. Click the globe icon and click the advance arrow to begin the NetBoot
process. This option doesn’t allow you to pick which image you want to boot from.
Like holding down the N key, you will get the default image.
It is important to note a couple of things that can upset the NetBoot process:
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If no network connection exists, a NetBoot client will eventually time out and look to
a local drive to start up. You can prevent this by keeping local hard drives free of sys-
tem software and denying users physical access to the Ethernet ports on a computer.
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Zapping the parameter ...