I have never seen this before with any kernel updates. Currently all versions 2.6.16 start fine, and the 2.6.17 before 2.7.2174 are OK. I am running FC5 on a Dell Latitude D820 that has SATA hard disk that FC5 treats as scsi, and it also has a CDRom which plugs into a modular bay. As best I can describe it, this is a USB device, but linux will treat it either as ide or scsi, depending on whether the parameter hdc=noprobe is in the kernel start line. Now, the problem with kernel-2.6.17-1.2174 (and the kernel-smp version as well) The kernel panics and it does not leave behind a log file. But I've copied down the messages that seem important. scsi_mod: Unknown parameter max_scsi_luns insmod: error inserting /lib/scsi-mod.ko -1 unknown symbol (a few more insmod errors concerning scsi) Unable to access resume device mount: could not find file system then the panic happens. I don't know what else might be relevant. I'm running the gnome-power-manager and related updates for hal from the Utopia website. That's the devel series that Richard Hughes offers. I previously had trouble getting a picture card reader to mount in the scsi subsystem and did put in an option max_scsi_luns in to modprobe.conf, but when this kernel problem came up, I removed that option and retried. Same result. Here's /etc/modprobe.conf: alias eth0 tg3 alias scsi_hostadapter ata_piix alias snd-card-0 snd-hda-intel options snd-card-0 index=0 options snd-hda-intel index=0 single_cmd=1 model=laptop-eapd remove snd-hda-intel { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || : ; }; /sbin/modprobe -r --ignore-remove snd-hda-intel install ipw3945 /sbin/modprobe --ignore-install ipw3945 ; sleep 1.0 ; /sbin/ipw3945d remove ipw3945 /sbin/ipw3945d --kill ; /sbin/modprobe -r --ignore-remove ipw3945 alias eth1 ipw3945 -- Paul E. Johnson Professor, Political Science 1541 Lilac Lane, Room 504 University of Kansas