I loaded BT5 onto an external 500GB HDD through the install icon on the live disk. When it reboots and i choose to boot from the external I get a black screen with a simple >_
It does not get to the grub loader however it does work on an older laptop I have laying around.

The main specs for this particular laptop is

Intel i7 1.6Ghz
6Gb DDR3 memory
ATI Radeon HD5870 1GB graphics card

If i left out anything important let me know so I can either edit the main post or provide a response