I am still running Fedora Core 4. When I recently updated my Kernel to the latest version and re-booted, LO and BEHOLD, I got the same IRQ mismatch problem and the kernel would not boot!! (Luckily I can still boot into my system using the previous kernel.) It appears, therefore, that it is the kernel that comes with the Fedora Core 5 boot disk that is causing the problem and it appears the problem is peculiar to only certain motherboards/bios systems. I have an Asus A7V8X Motherboard using Via KT400 chipset and AMD Athlon CPU. If I could somehow boot the Fedora Core 5 installation disk with an older kernel, I think I would have the problem licked!! Is this possible??