Booting to Usb upon start up to GRUB?

kreilly18 · #1 27th September 2012, 02:37 AM

Hello everyone I am kind of a newbie when it comes to Linux based OS so bear with me. I recently wiped my MacBook Pro and Installed Fedora. My problem is I am trying to install the Mac Lion OS X from a usb but I dont know how to get into any sort of menu when I start my computer to choose what I want it to boot from all that loads is GRUB and the only option is to start my Fedora opperating system and edit the kernal using the command promt. Idk if there are some combination of keys i can push to enter some sort of recovery mode or some way to get me to a boot menu. I have researched this on google for hours and have tried tech support with my linux savey friends and have gotten no where. If someone out there could please help me asap I would greatly appreciate it.

cazo · #2 27th September 2012, 07:33 AM

I don't have a MacBook Pro (or any recent Mac), but a Google search turned up this link

kreilly18 · #3 27th September 2012, 10:57 PM

Thanks for replying but, that wasnt much help to me. I also do not have a Fedora recovery option when GRUB loads. I only have one option and thats to boot Fedora normally. I just want to know how I can make my Macbook Pro boot from USB upon start up...

cazo · #4 28th September 2012, 07:21 AM

On the page I linked to, I interpreted it to mean that pressing the C key during startup would bring up a boot menu, where one of the choices would be a USB drive (assuming you have a bootable USB drive plugged in). Or, pressing the Option key would bring up the "Startup Manager" (where you could set the boot order?). This would be handled by the BIOS or EFI BootROM, before GRUB is even started.

Maybe I misunderstood what you are asking? It sounds to me like you wiped your MacOS to install Linux (Fedora?) & now you want to go (back) to OS X (instead of, or in addition to, Linux?). If so, a Mac forum might be more helpful (for that part).

secipolla · #5 28th September 2012, 01:14 PM

As cazo said, holding down the Option key when starting the computer should do it:
http://support.apple.com/kb/HT1948
http://superuser.com/questions/10443...-boot-from-usb

You can boot a usb drive from grub with plop boot manager but first try the obvious step cited earlier.