RH6.2 kernel turns uses an option that causes a panic on boot on new Athlons (slot A Thunderbird). The problem is caused by the disable CPUID option. Strangely, it's turned on in the kernel that's on the RH6.2 ISO, but if you get the standard RH6.2 kernel source, it's off by default. Rebuilding my kernel from the source with just the default options fixes the problem. Unfortunately, only very experience Linux users will be able to get the system booted so they are able to rebuild the kernel - so I hope you guys will offer an updated ISO!
*** This bug has been marked as a duplicate of 17207 ***