The other guide is wonderful but was getting out of control with too many posts with too many varied problems which made the good advice harder to dig out. A reposting of the process of that guide will likely be coming by the originator of the post. Now, in the meantime, here is a step-by-step process for installing Leopard on your pre-867Mhz G4 Macs AND if you only have a single layer DVD burner and no access to another Mac or hard drive to boot from: I did each step again as I went to make sure each step is valid and that the little points are noted (like when to select and deselect). Note, the original installer will not work if your Mac does not have a built-in processor of at least 867Mhz, therefore you must use a modified OSInstall.mkpg file that does not contain the instructions to abort installation on pre-867Mhz machines. 1. You should download this file here: http://www.dslreports.com/r0/download/1233284~ef912347c2c6f2be47c4b7280666aff6/NewOSInstall.mpkg.zip 2. Unzip the file, rename it OSInstall.mpkg and move it to your desktop for the sake of ease. 3. Mount the Original Leopard Installation DVD 4. Open Disc Utility (under Applications->Utilities) 5. Click on New Image near the top of the window (note: don't have any drives or disc images selected on the left side) 6. Name the image as dump (save on desktop) 7. Put the type as sparse image and encryption as none 8. Put the size as DL-DVD (8Gb), and click Create 9. Mount dump.sparse (most likely it did so automatically) 10. In Disk Utility, select the dump mounted image (white hard-drive looking thing on the left side of window) and click the Restore tab 11. Drag the mounted Mac OS X Install DVD to the Source field 12. Drag the mounted dump to the Destination field 13. Click the Restore button and wait (it took 15 minutes on mine) 14. Once that is done, go to Finder and find the dump mounted image 15. Command-Delete the XCode Tools folder under Optional Installs, then empty the Trash 16. Download and/or open TinkerTool. 17. In TinkerTool under the Finder tab, check the box "Show Hidden and System Files" 18. In TinkerTool hit the button that says "Relaunch Finder" 19. In the dump mounted image, navigate to System->Installation-> Packages 20. First select, and then Command-Delete all printer and foreign language packages (You can download printer files you need later from your printer company, or load from original install DVD later using Pacifist)(also, I kept AsianLanguageSupport because I wasn't sure if it was really a language) 21. You should have thrown away 27 files and have 31 items left 22. Empty the Trash 23. Command-Delete OSInstall.mpkg and empty the Trash 24. Open a new Finder window and click on Desktop or go to your desktop 25. Drag the modified OSInstall.mpkg file you downloaded into the Packages folder that is still open on the dump image (hit authenticate and enter password) 26. Return to Disc Utility, deselect dump, then reselect it to check on the size of your dump (should be 4.3Gb or less) 27. Deselect dump (make sure no drives or images are selected) 28. Click on New Image 29. Name the image as burn (save on desktop) 30. Put the type as sparse image and encryption as none 31. Put the size as SL-DVD(4.7Gb), and click Create 32. Select the mounted burn image and click the Restore tab 33. Drag the mounted dump to the Source field 34. Drag the mounted burn to the Destination field (dont mix up!!) 35. Click Restore and wait (about 10 minutes for me) 36. Reopen TinkerTool and now deselect "Show Hidden and System Files" and hit "Relaunch Finder" 37. Quit TinkerTool 38. Return to Disk Utility and select burn.sparseimage on the left side and go up and click the Burn yellow and black button 39. Insert a DVD-R and select your choice of burn speed (I use 6x as to better my non-coaster chances) and whether to verify (I say no) and start the burn process 40. After it is finished, check the mounted disk. See if it appears proper. 41. For the final check, reboot while holding down C on a USB wired keyboard. It will take considerable time to get through the gray screens, but be patient. 42. It should eventually get to the purple space scene background and the installer. 43. Select English, then accept all the legal stuff, and select your hard drive 44. Note that you MUST hit "Options" then Archive and Install, and also hit the "Customize" button before hitting the final "Install" button and deselect the foreign languages, the x11, and the printers. Then hit Install and it will work. PS It is much easier to use this guide if you print it off rather than keep going back and forth to a browser window. PS II: A potential downfall is that I don't know exactly how the OSInstall.mkpg file I linked to was modified, but it worked on my PM G4/533. Potential problems with your installs could be the result of the mod not being compatible with your particular machine.