Sounds to me like you need to play with grub 2's gfxmode or gfxpayload

When Knoppix boots and you can modify the grub boot options, try 
gfxmode=1024x768 or google gfxmode and your video card to find valid 
options.

gfxpayload=normal nomodeset
gfxmode=normal nomodeset

Try this for additional info: https://wiki.ubuntu.com/FrameBuffer



On Sunday, October 05, 2014 22:55:08 Mark Jarvis wrote:
> The venerable CD of my old favorite, knoppix, having died, I 
downloaded
> the 64 bit DVD ISO (I have a 64 bit system) & burned it to a DVD. I
> booted from the DVD and at the boot prompt typed the knoppx64 
option. It
> started off just fine, then went to a totally blank screen. The last
> couple of lines before it went blank went by too fast to really notice.
> The md5sum of the downloaded ISO matches.
> 
> Does anyone have an idea of what the problem is, and more 
importantly,
> what to do about it?
> 
> Many thanks for any help!
> 
> 
> 
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