First I just want to say I've check the Md5 sum and burned at 4x speed, so those are not my problems.

Here are my system specs: Intel P4 Northwood 3.4ghz, Asus P4C800-E mobo, 2gb of Corsair CMX-DDR400 memory (4x512), 36gb WD Raptor, Nvidia 7800gs.

When I boot to the Knoppix cd the splash screen comes up and says to hit enter to continue loading Knoppix. I hit enter and it says it's loading then all of a sudden the screen goes black and stays that way until I reboot. This exact same problem happens with Ubuntu when I try to use it as a Live cd. Also, my memory has LED's on the end of each stick. When the screen goes black, the first and third sticks' LEDs go red and freeze, and the second and fourth sticks' LEDs turn green and freeze (normally the LEDs are constantly flashing under any kind of use). Could I have a hardware incompatibility? The memory is fine b/c I've run MemTest on all of the sticks and I use this computer everyday in Windows XP with no memory problems. Thanks for your help.