- turn on PC
- choose a resolution from Grub's menu but DON'T press Enter
- press 'E' instead
- move cursor after "ATA=32bit" and change it either to "ATA=nodma" or "ATA=nopci" (depending on what it works for you)
- press Ctrl+X to continue booting
If booting has success open /boot/grub/grub2.cfg with the AROS editor, search for the "ATA=32bit" string and replace it with "ATA=nodma" or "ATA=nopci". You can do this easily, using the 'replace' option in the 'search' menu of the editor.