Dell PowerEdge SC1425 - Boot Error from USB

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http://serverfault.com – I'm new to hosting, and I got my first server a couple of days ago, and am having troubles. I'm trying to boot Ubuntu Server 12.04 from a USB Device I have, and when I attempt to boot, I get "Boot Error" Following a guide I saw ( http://www.planetmy.com/blog/how-to-configure-dell-server-bios-boot-from... ) I made sure USB's are enabled with BIOS support and it boots with the USB. It seems to run on any other computer just fine. Any solutions? my server came with 2 SATA caddies installed, has 6GB DDR2 RAM with an intel xeon dual 2.8GHz processor. Thanks! (HowTos)