I’m guessing this should also work on later Intel Macbooks in the 2006-2010 era, but don’t have mine anymore to test it, so I’m not 100% sure.
At the command prompt, type: boot ud:,\\:tbxi If that doesn’t work try boot or boot At that stage you should see mac os installation boot starting, if none of those above commands work, you can still try all of the other troubleshooting steps at This is the blog post where I got the firmware instructions from to begin with and is probably the best documentation online. This will get you to the open firmware screen. Put the usb drive in the iBook, then turn it on and hold down ‘apple key, option, O and F keys right after you hear the mac chime. Transmac gives you a 15 day trial, which is plenty long enough to burn Leopard or whatever Mac image you plan on restoring. In Transmac, open it in administrator mode, then right click the drive you want to put the image on, and select ‘restore from image’. On a mac use Disk Utility and the restore disk image feature to create the USB drive. 
You need to create the USB stick on a Mac, or with Transmac for PC. 
You cannot use a USB 3 stick, nor even a USB 3 port! You must use a USB 2 (or 1) drive and port. When you’re creating the Mac image on the USB stick, it has to be done in a very specific way.For many years I always thought that booting from a USB stick was impossible on these systems, but alas it is very possible and not even that hard! You just have to do things a certain way. I love vintage macs, especially the PPC era macs like the iBook G4, and the Powerbook.
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