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In order to boot from USB external drive, the first thing is to make sure system bios supports it. What is your system brand / model? 
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In order to boot from USB external drive, the first thing is to make sure system bios supports it. What is your system brand / model?

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Take a look carefully, make sure you have been go through all the setting under CMOS ....... sometimes you may miss out something. 
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Take a look carefully, make sure you have been go through all the setting under CMOS ....... sometimes you may miss out something.

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I am trying to change the boot sequence on my IBM ThinkCentre. Im in the BIOS but cannot see anything that will allow me to change the boot sequence. Im running Win XP (if that matters??).<br />
My purpose is to get the machine to boot from an OS off of my external USB hard drive.
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I am trying to change the boot sequence on my IBM ThinkCentre. Im in the BIOS but cannot see anything that will allow me to change the boot sequence. Im running Win XP (if that matters??).
My purpose is to get the machine to boot from an OS off of my external USB hard drive.

IBM ThinkCentre boot sequence

A personal computer is a general-purpose computer whose size, capabilities and price make it useful for individuals, and is intended to be operated directly by an end-user with no intervening computer time-sharing models that allowed systems to be used by many people, usually at the same time. Personal computers may be connected to a local area network (LAN), either by a cable or a wireless connection, and through that to the Internet. A personal computer may be a laptop computer or a desktop computer running an operating system such as Windows, Linux or Macintosh OS.