Question: Q: Macbook Air Won't Boot from USB Stick. This may sound obvious, but check to see if your Mac has power or if its battery needs charging. The first Mac was the MacBook Air which came out in January 2008. Says PID 0 prohibited (that's the kernal). MacBook Pro, 15" (Early 2011), not booting. The key thing to understand is that the machine won't just boot from any attached external drive. Or would you have more ideas I could try? M1 Macs can boot from any selected external drive with full security, which verifies the integrity of the operating system. 1. 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). I take SSD out, try putting it in a USB hardrive tray reader, nothing. I guess I'm out of luck. As a result, booting from USB media is becoming the standard. I run diskutil force unmount for each disk successfully but it still won't unmount the main disk. 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. 1. Mac won't boot from USB drive: Prohibited sign. The older MacBooks & MacBook Pro’s didn’t offer USB boot support. Specifically, the Lion thumb drive that I made a few months ago worked fine with an early 2008 MacBook Pro, but didn't show up in the boot picker on a mid-2007 MacBook (MacBook2,1) or a 2008 Mac … I waited exactly 30 minutes and it still won't show up. Here's how to boot … 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. 2. I had it working but wanted to remove it all and try again. 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. Now when I boot, that SSD freezes up my BIOS. But it won't boot. Installing macOS on a new HDD from USB drive stuck on grey screen with Stop sign. So I have reset the PRAM and SMC and tried again. 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. Either way, here are the troubleshooting steps you should take to fix a Mac that won’t boot. I'm having an issue all of the sudden with trying to restore Lion on my Air. 1. For desktop Macs, a cable may have come unplugged. Again, after having waited 30 minutes the USB won't show up. My Mac won’t turn on — now what? 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