However, if I recall correctly, emulation of BIOS is not supported on Mac for any device that is not attached via a SATA connection (ie. Internal drive, DVD drive). So, I believe that you cannot boot from your USB key. If you want, you could install an alternative bootloader on your Mac that would allow you to do this. See this post for more info. Here is the sequence of events: • I have a 15' MacBook Pro (mid 2012 IIRC 2009). Its HDD crashed. • I replaced the HDD with another Toshiba HDD from my Dell laptop (which was running Windows 7). The Apple service center guys did it for me. • I have another 13' MacBook Pro (Early 2015) which is running El Capitan • On this second MacBook Pro, I created a bootable installer for macOS Sierra on an 8GB USB drive as per the steps here: • Inserted the USB drive into the old MacBook Pro, started it up, held down the Alt (Option) key. • I am shown HDD and USB drive as options for boot disk. Touchpad doesn't work, only keyboard works. I choose USB using right arrow key and hit return. • After a couple of seconds screen turns grey with the stop (Forbidden) symbol at the center. A minute or so later system shuts down. • I try to boot multiple times, same result. • I reset PRAM (Cmd + Alt (Option) + p + r), but no difference. • Cmd + R at system startup to get into Recovery Mode did not work. (I guess this requires a OS to be installed) What am I doing wrong? Any help in getting macOS installed on the replaced HDD is greatly appreciated. Few things to note: • The old MacBook on which I am trying to install macOS sierra is a HDD machine, which the new MacBook on which I downloaded the OS and created the bootable installer is a SSD machine. • The replaced HDD put in the old MacBook is good and functional because just before being put in, I attached it to my new MacBook using an HDD adapter and copied contents. • I do not need the data on the HDD. It can be wiped clean before installing macOS Sierra. • The last OS version run by the old MacBook Pro is Mavericks (10.9). I am absolutely fine installing a version of OS X as old as Mavericks. I am not particular about macOS Sierra itself. I just need to know where I can get older versions. Please let me know if any more information is needed to suggest a solution. Answer to this talks about using Disk Utility from the USB drive. How do I do that? Update 2: I was able to boot the new MBP using the USB drive. It went all they till I was shown the options to install or start disk utility, etc. So Thumbdrive is all good, the new HDD is also good. So is it the case that since the installation USB drive was created on a newer MBP, the bootable part was created in such a way that the old MBP is not able to understand. Have there been changes in the boot table across Macs? UEFI v/s BIOS or EFI v/s MBR - anything like that? Update 1: Adding photos showing the screen state Windows is trying to bootup. So HDD is good USB drive is appearing as a boot option. So drive is properly formatted? It stops at this point on selecting USB drive. ![]() Image via Before You Start The obvious first step here is to. But before you do anything else, a word of caution: once you've used the OS X installer, it will automatically delete the file you need to make the backup disk, so you'll want to either make a copy of the installer or create your disk before you upgrade. You can use a USB flash drive, external hard drive, or DVD-R disc, but the USB drive is quicker. If you're using a USB drive, it has to be formatted as 'Mac OS Extended (Journaled)' and set to partition type 'GUID Partition Table' in order to work. Image via Once inside, browse to the ' Contents > SharedSupport' folder where there will be a file called ' InstallESD.dmg.' This is the image file that contains the information you need to create the backup disk. Step 2: Open Disk Utility (located in your Applications > Utilities folder). Step 3: Drag and drop the ' InstallESD.dmg' into the list of drives on the left and select it. This should make it appear in the Source box on the right. If not, you may have to click the ' Restore' tab as seen below.
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