4.0.2 wont boot

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cant get 4.0.2 to boot. i press enter at boot prompt. i get Loading linux…….and it stops there. Any ideas?
i tried:
knoppix noacpi acpi=off
knoppix noapic noacpi
failsafe
plus a few other (seemingly relevant from a newbie perspective) cheat codes, but it still hangs at Loading linux…………

[WaKa]

btw did you burn it at 4 i.e?
mkisofs -r -o cd_image KNOPPIX_<version>-EN.iso
cdrecord -v speed=4 dev=0,0,0 -data KNOPPIX_<version>-EN.iso

----- edit -----
oops! my bad

is it a CD?
need more info please.
----- edit -----
double oops!!
this is done on a Linux OS on a HD

[RGP]

i burned it at 2x onto a cd......i don't know what this means: cdrecord -v speed=4 dev=0,0,0 -data cd_image

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problem solved......thank you for replies