Satellite C50-A-1FT - How to boot from the USB stick

hi,
this is last stop really as have run out of ideas,have asked every techie that know including taking it to an independant computer store.
I am using a toshiba satelite C55 a-1d5, with windows eight preinstalled.
I am trying to get Ubuntu booting off a Toshiba G3 USB stick [sixty four gb capacity],theres nothing wrong with the stick or the multiple distros on it.
so have followed all the advice Ive found and obviously as woud usualy do-on the BIOS/UEFI screen have made sure the boot sequence has USB first,but when using the CSM boot order it wont boot the USB stick it just gets over runned by Windows 8.
I tried to deactive from the BIOS the "secure Boot" or something like that, but it seems to be already off... and its weird because my laptop is new. just bought it 2 days ago.
please can any kind soul take pity and offer reasons why this may be happening or even better,know how to get linux on it? thanks in advance
Message was edited by: yoctomx1

Seems that you could solve this issue disabling the secure boot in BIOS as well in registry:
HKeyLocalMachine\System\CurrentControlSet\Control\ SecureBoot\State
(UEFISecureBootEnabled needs to be set to 0 to disable SecureBoot within the system)
But to be honest this should not affect the USB booting in case the Windows 8 (or Win 8.1) has been completely powered OFF.

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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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McDoenerKing wrote:Was the usb stick mounted, when issueing the dd command?
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i wrote exactly
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Satellite C50-A-1FT - How to boot from the USB stick

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