I'm using Vector Linux 5.8 STD Gold. The iso's md5 sum checked out fine.
When I restart with the CD in the drive, it shows the VL splash screen, and tells me to press enter, or select the type of kernel to load. After I press enter, or select any kernel type from the list (scsi, sata, linux, linux2, scsi2) it says it's loading linux, and the inirt (or something of the sorts), then it immediately goes to a black screen with a blinking white underscore. After that, I hear my hard drive click, and the computer is locked up, but the underscore continues to blink.
(I'm getting the same problem with Knoppix 5.1.1, as it locks up in the same place, with that blinking underscore. However Knoppix 5.0.1 boots fine.)