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<blockquote data-quote="Earthworm Jim" data-source="post: 404005" data-attributes="member: 31708">I just experienced something similar with an old g3 imac.&nbsp; In my case, I had to change the firmware alias for 'cd' to point to the USB device before it would boot successfully.&nbsp; Hold down CTRL+OPTION+O+F, hit power button, get a firmware prompt.&nbsp; Note:&nbsp; your device path may be different from mine.&nbsp; at the firmware prompt type dev / ls to get a list of the attached devices:0&gt; dev / ls&lt;you'll get a list of devices - figure out the path to your USB cd drive, then -&gt;0&gt; devalias cd /pci@f2000000/usb@19/disk@10&gt; boot cd,\\:tbxiWhen my system restarts, the alias for 'cd' points to the built in CD-ROM device.&nbsp; YMMV, I took a few lucky guesses. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin&nbsp; &nbsp; :D" loading="lazy" data-shortname=":D" /></blockquote>

[QUOTE="Earthworm Jim, post: 404005, member: 31708"] I just experienced something similar with an old g3 imac. In my case, I had to change the firmware alias for 'cd' to point to the USB device before it would boot successfully. Hold down CTRL+OPTION+O+F, hit power button, get a firmware prompt. Note: your device path may be different from mine. at the firmware prompt type dev / ls to get a list of the attached devices: 0> dev / ls <you'll get a list of devices - figure out the path to your USB cd drive, then -> 0> devalias cd /pci@f2000000/usb@19/disk@1 0> boot cd,\\:tbxi When my system restarts, the alias for 'cd' points to the built in CD-ROM device. YMMV, I took a few lucky guesses. :D [/QUOTE]

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