satellite l850d won't boot from usb,even bios is set to boot from usb

Harv1

Estimable
Apr 24, 2014
1
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4,510
I have ubuntu 12.04 installed,I am trying to boot into zorin os 8 on a usb stick.bios is set to boot from usb but it doesn't it goes straight into ubuntu and loads .It works great on my acer.don't know what else to do.Please help?