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I have an old MacBook laying around not doing much, so I decided to install Ubuntu 13.04 on it, and dual boot with OSX.

From within OSX, I repartitioned the drive, reserving half of the 250gb HDD for each OSX, and Ubuntu.

I plugged in my bootable USB drive created using UNetBootin, and booted into Ubuntu. I installed the OS, and rebooted my system after removing the USB.

I got to the GRUB menu, and selected Ubuntu... The GRUB menu disappears, and the screen just stays the purple background color of GRUB.

Rebooted

I got to the GRUB menu, and selected OSX, I got the same purple screen, but after a short while I got this.

a picture

I replugged my bootable USB and rebooted

After selecting UFI boot, I see Secure boot not enabled, and then the screen goes black...

What can I do to repair my MacBook? What could be causing it to no longer boot from either HDD or USB?

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Black screen with no text whatsoever? –  Alex Apr 28 at 1:20
    
Well, purple. The GRUB Menu just goes away, and the screen stays the background color. –  Matt Clark Apr 28 at 1:22
    
If I'm not mistaken, secureboot will prevent USB boot and maybe Ubuntu from booting as well. –  mchid Apr 28 at 3:00
    
Not sure if this helps, but Macs do not boot in the same manner as Linux/Unix/Win systems (even though Mac is kinda Unix like). They do not use a "BIOS" rather OpenFirmware. The UEFI boot will not work either since that is (for brevity) updated BIOS. According to unetbootin's site, you cannot do a liveboot from USB on Mac (but install should have worked). There does not seem to be a lot of documentation on site for Mac. As for error message, I am not sure.. but it looks like your OS kernel is in the wrong spot, janky, or partially missing.. some terms(xnu=kernel, kext=kernel extensions) –  No Time Apr 29 at 21:12
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Have you tried 14.04? There is now a MAC specific .ISO that is supposed to help alleviate some of the MAC problems (mostly UEFI if I understand right). –  0xSheepdog May 2 at 1:11
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1 Answer 1

Reinstall OSX Unless your old macbook has an intel CPU I don't think it's supported under Ubuntu 13.04, which is at EOL anyway (end of life out of support)

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