That question mark means that the mac can't find the operating system. (Probably because the hard drive was formatted.) Try reading this page. It looks pretty complicated (plus, since your computer is a G4, it probably won't work) You could also try to hold down 'C' (with the USB stick plugged in). The biggest problem you have is that the PowerPC processor which is in the G4 doesn't support booting from a thumb drive. The first macs that supported that were the ones with the intel processors. You may need to try to burn osx 10.5 to a CD or DVD (if the file is bigger that 4 GB, you'll probably need a Dual Layer DVD, which are a little bit more expensive).

Possibly the best solution to using a hard drive with both Windows and Mac without the use of third-party software is creating two partitions on the drive, one for Windows and one for Mac. Often, the best option to fix these problems would be to reformat your computer and reinstall your OS, but since most of us don't plan on ever taking this drastic measure, we don't obtain a recovery disc or thumb drive.

Now since your keyboard isn't made by Apple you might not be able to get this work, but a lot of other keyboards DO work. Here's what I would try.

How to make a bootable usb drive windows 7 using mac. Step 2: Once you installed this tool in your OS, then open it [if you are using its ‘Portable’ version, then directly open it]. Let’s see what are the simple steps to make a bootable USB, Pendrive or SD Card. Step 1: First Go to and select your Operating System from the list to download its Portable or Installer file.

-Burn OSX to a CD or DVD -Put the DVD in the G4 (This computer doesn't have an eject button on the outside, so you'll need to get a mac keyboard that has an 'eject' key on it OR get messy and try to get it open by taking the cover of. Might be messy.) -Turn off the G4 -Hold down 'C' when you turn on the computer.

-That should boot from the disk. And then you can follow the instructions to install it.

(During instillation you'll need to open Disk Utility (Utilities>Make powerpoint for mac 2016 hd. Disk Utility) and check if your drive is the right format (Mac OS extended (Journaled)) and partitioned to the GUID partition scheme.) Good luck! 'I downloaded osx 10.5' Downloaded from where? Buy a proper version of OS X (I'd go for 10.4 rather than 10.5, which will run like a dog on your machine). EBay is probably your only source nowadays, but be sure to get the right disk.

You need either a retail version or the disk that is specific to your particular model. Most disks on eBay are model-specific, and the chances are they are not for your model. As already said, CD/DVD is your only real option for install; you wouldn't be able to burn an installable CD without a Mac in the first place, so Catch-22 there. Alternatively, forget OS X and install Linux on it.

Hard Drive Format for Mac and PC Both Mac OS X and Windows allow users to format their hard drives using built-in utilities. Even though most people associate formatting with system installation, there are many other reasons why you might want to format your hard drive. When you purchase a brand-new hard drive, there’s no guarantee that it will be pre-formatted from the factory, nor is there any guarantee that it will come with the right file system. Optimization is another good reason for hard drive formatting. Data fragmentation remains an issue even in the era of mobile devices, and in some cases formatting is the fastest way how to solve it. Of course, you may also just want to quickly delete the content of an entire hard drive.