Can't get 2 computers to boot from a flash drive
I can't get 2 of my computers to boot from an Acronis boot drive that I made. I checked the boot drive out in a 3rd computer and it works just fine.
The 2 computers are:
a Dell Inspiron 5000 Series (Model i5570-3064BLU-PUS) and
a Levono IdeaPad S340 (Model 81QF0002US)
Neither computer's BIOS permits me to boot the system from anything but the internal drive.
Any help would be greatly appreciated.


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Neither computer's BIOS permits me to boot the system from anything but the internal drive.
If this is a bios limitation, that may be an issue. Most motherboards will allow you to tweak settings to allow booting from a third party drive though. You may need to refer to you bios firmware user documentation though.
Typically, the controlling setting is secure boot and needs to be disabled. The Dell should be able to modify this for sure. Some Lenovo's are trickier than others.
Check this youtube video as an example:
On my Asus and a previous Acer, I had to disable secure boot. Save and exit the bios. Then go back in and delete the secure boot keys (they can be recreated again later if you ever want to turn it back on). Then save and exit the bios again.
On the Acer, I also had to enable CSM/legacy mode to boot anything external. Even though I was only needing/wanting to boot the USB drive in UEFI mode. It was a requirement of that particular bios though. Did that, then used my one-time boot menu option (usually F12, but can be F1, F2, esc, del, or something else depending on the system - dell's are usually F12) and made sure I was using the UEFI boot entry for the USB drive.
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