The Active@ Boot Disk bootable media isn't booting up my system after I've selected the correct Boot Priority. It sits at a blank screen or boots from the hard drive instead. What can I do?
This is most commonly caused by one of two settings in your system's UEFI/BIOS firmware:
1. Secure Boot (most common cause on modern systems)
Most current UEFI systems ship with Secure Boot enabled, which only allows digitally signed bootloaders to run. If the boot media doesn't start, or the system silently falls back to the hard drive, temporarily disable Secure Boot:
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Enter your system's firmware setup (commonly Del, F2, or F10 right after powering on — check your manufacturer's documentation if unsure).
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Look for a Security tab or section, find Secure Boot, and set it to Disabled.
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Save changes and reboot.
2. Boot mode: UEFI vs. Legacy/CSM (older systems only)
On older systems that still offer a Legacy/CSM (Compatibility Support Module) boot mode, some non-UEFI-signed bootable media may only start correctly with UEFI/CSM configured to boot in Legacy mode. If your firmware includes an option such as "UEFI/BIOS Boot Mode" or "UEFI Boot," and disabling Secure Boot alone doesn't resolve the issue, try switching from "UEFI" to "Legacy" (or "UEFI Boot" to "Disabled").
Many current-generation motherboards (roughly 2021 onward) no longer offer a Legacy/CSM boot mode at all. On such systems, disabling Secure Boot is the primary — and often only — setting needed.
Once you've finished your operation with the boot environment, go back into the firmware settings and re-enable Secure Boot (and switch back to UEFI mode, if you changed it) to restore your system's normal security configuration.