[ubuntu] Unable to Install

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http://ubuntuforums.org – I've purchased a PC from eBuyer, which has NO OS installed. Spec is as follows: AMD A4 3300 2.5Ghz Processor; 4GB RAM; 320GB HDD; DVD Writer; AMD Radeon HD6410D; No Operating System.I've downloaded Ubuntu 12.04LTS and created a Boot USB following the instructions on the Ubuntu website. When I put the USB in and power on the PC; it asks me whether I want to run Live; Install or Check Disc for Errors. I've tried both Live and Install and they just take me to a black screen and nothing happens. If I escape that screen the PC Boots up to "EFI Shell version 1.31 (4.653) current running mode 1. (Hardware)