I CAN successfully and easily install Ubuntu 14 using the +mac installer. It works beautifully and booting is almost flawless (just a slight delay). I don't need to hold option, or 'C' or select anything at a boot menu. It just boots.
So now I come to try to install CentOS and while the installer works perfectly (once I'd modified the ISO to remove EFI support and force it to use BIOS) HOWEVER, when I come to boot the new installation, I just get a flashing question mark.
Someone has posited that CentOS installed itself as GPT rather than MBR and therein lie the root of my woes.
Does anyone know if it's possible to:-
- Use rEFInd to 'repair' the boot loader so that it can 'find' the new OS? This may not be possible? I gather the Mac can ONLY boot alternative OS from MBR partitions ?
- Install Ubuntu 14 (which boots just fine without the flashing question mark business and then somehow selectively overwrite the Ubuntu installation with CentOS??
- Reinstall CentOS but this time INSIST (somehow?) it uses MBR instead of GPT?