I can't even get past the BIOS logo. Here's how to boot … 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. My Mac won’t turn on — now what? If any of these information gets corrupt, your MacBook Pro may fail to start properly or won’t start at all. I run diskutil force unmount for each disk successfully but it still won't unmount the main disk. I waited exactly 30 minutes and it still won't show up. Or would you have more ideas I could try? Says PID 0 prohibited (that's the kernal). I'm having an issue all of the sudden with trying to restore Lion on my Air. As a result, booting from USB media is becoming the standard. 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 … Either way, here are the troubleshooting steps you should take to fix a Mac that won’t boot. 1. Macbook keeps rebooting on installation USB after trying to reinstall - EFI partition empty. I had it working but wanted to remove it all and try again. So I have reset the PRAM and SMC and tried 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. Installing macOS on a new HDD from USB drive stuck on grey screen with Stop sign. It does not prevent booting from external drives. 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. Question: Q: Macbook Air Won't Boot from USB Stick. The first Mac was the MacBook Air which came out in January 2008. Now when I boot, that SSD freezes up my BIOS. The key thing to understand is that the machine won't just boot from any attached external drive. 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. MacBook Pro, 15" (Early 2011), not booting. I've been messing around with partitions and setting up triple boot (linx,windows,mac). Again, after having waited 30 minutes the USB won't show up. This may sound obvious, but check to see if your Mac has power or if its battery needs charging. For desktop Macs, a cable may have come unplugged. The older MacBooks & MacBook Pro’s didn’t offer USB boot support. 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