I downloaded and verified BT5R3-GNOME-32.iso and loaded it to a usb with unetbootin.
It boots to the command prompt. When I type startx, the screen goes black, the Caps Lock and Scoll Lock indicators on my keyboard start flashing, and the computer is locked. I tried BT5R3-KDE-32.iso, BT5-KDE-64.iso, and BT5R3-KDE-64.iso, same result.
I am using a Dell Vostro 3400, which has Intel HD Graphics and an i3-350 processor.