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It does not prevent booting from external drives. And while users historically would pop a boot media disk into their DVD or CD drive, many computers no longer come with optical disk drives. Again, after having waited 30 minutes the USB won't show up. I waited exactly 30 minutes and it still won't show up. It’s been a while that I’ve had to worry about it but I do believe the 2007 & 2008 models are the last ones that required boot up from either the internal optical drive or an external FireWire drive (prepped with Mac OS-X as a bootable drive). So I have reset the PRAM and SMC and tried again. I guess I'm out of luck. If any of these information gets corrupt, your MacBook Pro may fail to start properly or won’t start at all. The older MacBooks & MacBook Pro’s didn’t offer USB boot support. NVRAM or PRAM (in older Mac computers) stores the information about system settings such as the startup disk to boot your Mac from, system date and time, screen resolution, etc. Here's how to boot … 1. As a result, booting from USB media is becoming the standard. I plug it into the Thunderbolt-2 port on the Mac Mini, and the computer *does* see that partition, but it won't boot to it -- the computer simply turns itself off after about 5 seconds of trying to boot to that drive. Macbook keeps rebooting on installation USB after trying to reinstall - EFI partition empty. M1 Macs can boot from any selected external drive with full security, which verifies the integrity of the operating system. The first Mac was the MacBook Air which came out in January 2008. MacBook Pro, 15" (Early 2011), not booting. This may sound obvious, but check to see if your Mac has power or if its battery needs charging. Indeed, I ment that I only get the option to booth from HDD, the USB drive is not shown as an option to boot from. For desktop Macs, a cable may have come unplugged. My Mac won’t turn on — now what? The key thing to understand is that the machine won't just boot from any attached external drive. 2. If you have bought an M1-based Mac or MacBook but need to upgrade your storage without buying a brand new device, you can set up your Mac to run from an external drive. 1. Either way, here are the troubleshooting steps you should take to fix a Mac that won’t boot. I take SSD out, try putting it in a USB hardrive tray reader, nothing. 1. I've been messing around with partitions and setting up triple boot (linx,windows,mac). Now when I boot, that SSD freezes up my BIOS. Or would you have more ideas I could try? But it won't boot. Installing macOS on a new HDD from USB drive stuck on grey screen with Stop sign. I had it working but wanted to remove it all and try again. 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