I've been having the same problem since 2.6.3-1.106; it's now happens with every version of the kernel that I try to use. Take a look at bug #117658, which I posted a few hours ago. See if you have anything to add to that. You can also look at the 'system crash' thread that I started on the list on 2/26/04. From that thread, a temporary 'workaround' is to arrow to the kernel version you want to boot, hit 'e', arrow down one and hit 'e' again, change 'rhgb' to 'nogui', hit 'enter' and then hit 'b' to boot. The change is only for that boot (i.e., you have to redo it every time unless you changed it in grub.conf). See if you get the other problem I describe in the bug report after doing the above.
Richard Ayer III