Error booting with cheatcode knoppix screen=1024x768 noudev

[djmotita]

Hi everybody, i'm trying boot from usb-cdrom but i can't get it, i use this cheat code knoppix screen=1024x768 noudev but the screen freeze in this step, i hope somebody know what's happening on this, i left a screen for a better view...
Thanks!!!

http://img129.imagevenue.com/loc231/th_62002_freeze_122_231lo.jpg (http://img129.imagevenue.com/img.php?image=62002_freeze_122_231lo.jpg)