2

I have a bootable Sierra SD card that doesn't show up in Startup Disk but it does mount in finder. I can boot other MacBooks with that SD card but on this one it will not work. I've also tied to burn InstallESD.dmg to a dual layer DVD and that doesn't show up in startup disks either but I can boot from an old Mountain Lion DVD just fine. I have also tried booting from a thumb drive no luck there either. I know it can handle Sierra as it's on there now but the user wants it securely erased and reinstalled.

You must log in to answer this question.

Browse other questions tagged .