I'm unable to boot from a Mavericks install USB stick that works on all of my other macs. Anyone else have this problem?
After starting the laptop with OPTION button pressed down I select the "Install Mavericks" USB stick to boot from, but instead of showing the Apple logo on the screen it just shows a "forbidden sign" (see attached photo) instantly.
I've tried this with a USB stick and also on a USB hard drive. They work fine with my other macs (2013 MBA and a 2010 MBA) but not on this new rMBP.
I would need this to fix my EFI partition table, which cannot be fixed from the Recovery Partition since it is on the same drive. It refuses to fix a drive when it is in use.
Any hints for me? Maybe I need to finally buy a thunderbolt cable and then start the rMBP in target disk mode and then fix the partition from my 2013 MBA using Disk Utility?
Thanks!
After starting the laptop with OPTION button pressed down I select the "Install Mavericks" USB stick to boot from, but instead of showing the Apple logo on the screen it just shows a "forbidden sign" (see attached photo) instantly.
I've tried this with a USB stick and also on a USB hard drive. They work fine with my other macs (2013 MBA and a 2010 MBA) but not on this new rMBP.
I would need this to fix my EFI partition table, which cannot be fixed from the Recovery Partition since it is on the same drive. It refuses to fix a drive when it is in use.
Any hints for me? Maybe I need to finally buy a thunderbolt cable and then start the rMBP in target disk mode and then fix the partition from my 2013 MBA using Disk Utility?
Thanks!