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Windows Boot manager somehow seems to be taking precedence.I have Windows 7, Linux Mint and Ubuntu installed on my hard-drive.Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange I can't boot from USB even though the BIOS is set to boot from USB first.I had used a USB 3 port on my machine to build the USB.
Also if you have a keyboard with USB port, you must enable "USB keyboard".
If the USB keyboard is not enabled at the step "Press any key to load from USB..." you cannot enter USB because the keyboard stops to function at this step if it's not enabled as USB keyboard.
In my case of this exact issue I had created the bootable USB using a Microsoft tool and a Microsoft ISO image.
In the BIOS settings, I found that the problem was in the hard drive setting sections, so I changed the HDD setting from SATA to Sandisk.
The BIOS setting was still When you can't find the Compatibility Support Module (CSM), the legacy, and if Rufus seems too complicated and none of the other options in the answers listed here suites you, try a reset of your BIOS to "Optimized Defaults".
You can learn how to reset the SMC on all Macs here in our detailed tutorial.