Anyone use Knoppix as a Live boot CD? I keep getting this error:

Accessing KNOPPIX CD at /dev/hda.../cdrom/KNOPPIX/modules/insmod: I/O Error
Can't find KNOPPIX filesystem, sorry.
Dropping you to a (very limited) shell.
Press reset button to quit


Where is the reset button or reset command? I am a newbee and can't find this information, either online or in forums?

Thanks,
Stuart