I have a couple of 64-Bit Xeon's with CentOS 4.2 x86_64 installed on them. They don't all have the same motherboards. I've having a difficult time getting CentOS 4.2 x86_64 to boot on some of them in SMP mode (UP works fine). After the installation of CD, it boots up but kernel panics with the following error: Badness in i8042_panic_blink at drivers/input/serio/i8042.c:992 This is the call trace: apic_timer_interrupt+133 vgacon_cursor+0 oops_end+64 release_console_sem+369 error_exit+0 :scsi_mod:scsi_delete_timer+19 :3w_9xxx:twa_interrupt+1323 do_IRQ+197 mwait_idle+86 cpu_idle+26 The Uni processor works fine. I tried the SMP kernel from Fedora Core 4 x86_64 which works fine as well. Any idea what's going on here? I've already tried disabling as many things from the BIOS as possible. Thanks for any help.