It seems to me like the video driver is not working at all with your video card....When in text mode, do not try to run startx or start the X's...Instead, try to see what driver is being used..
At prompt, try this:
xx@xx:> lspci | grep -i vga (see the video card model)
Then look for some video driver loaded at start up:
I do not know the video card model you have.
Also try to read the dmesg:
cat /var/log/dmesg and try to look for problems regarding your video card..
If I were you, I would do:
1. Search for the linux driver depending on your video model.
2. Uninstall the video used by BT5 (all in text mode, do not start X's)
3. Black list it.
4. Install video driver previously downloaded...