I was running FC4 and I was running fine with kernel-2.6.15-1.1833_FC4.i686.rpm. Then kernel-2.6.16-1.2069_FC4.i686.rpm came out and I upgraded, but my machine wouldn't boot with it. Since FC4 has now transitioned to the Fedora legacy project I decided to try FC5 since the kernel was still kernel-2.6.15-1.2054_FC5.i686.rpm. So I did an upgrade from FC4 to FC5. I have found out since that the 2.6.15 kernel is more like 2.6.16. My machine wouldn't boot with the new FC5 kernel. I tried the new 2.6.17 kernel and it doesn't work either. I was able to load the FC4 kernel-2.6.15-1.1833_FC4.i686.rpm and my machine now boots. It appears to not be able to find my SATA disks when sata_via.ko loads. This is what I see when I boot: Booting 'Fedora Core (2.6.15-1.2054_FC5)' root (hd0,0) Filesystem type is ext2fs, partition type 0x83 kernel /vmlinux-2.6.15-1.2054_FC5 ro root=/dev/V0/L1 acpi=off rhgb quiet [Linux-bzImage, setup=0x1e00, size=0x16eb71] initrd /initrd-2.6.15-1.2054_FC5.img [Linux-initrd @ 0x37e3c000, 0x1b312a bytes] Uncompressing Linux... Ok, booting the kernel. Red Hat nash version 5.0.32 starting ata1: failed to set xfermode, disabled ata2: failed to set xfermode, disabled device-mapper: dm-mirror: Device lookup failure device-mapper: reload ioctl failed: No such device or address Unable to open /dev/mapper/via_jheaibjjh - unrecognised disk label. Reading all physical volumes. This may take a while... No volume groups found Unable to find volume group "V0" Unable to access resume device (/dev/V0/L0) mount: could not find filesystem '/dev/root' setuproot: moving /dev failed: No such file or directory setuproot: error mounting /proc: No such file or directory setuproot: error mounting /sys: No such file or directory switchroot: mount failed: No such file or directory Kernel panic - not syncing: Attempted to kill init! With kernel 2.6.17-1.2187_FC5 the message is pretty much the same except for: ata1: failed to set xfermode (err_mask=0x4) ata2: failed to set xfermode (err_mask=0x4) A couple of people have suggested running mkinitrd and I have upgraded it and created a new initrd file and it does the same thing. When I boot from the installation DVD in linux rescue mode it load sata_via And everything is fine. Just can't boot off the SATA drive. I would like to be able to use the current kernel. I am just not sure how to figure out what broke. Is it possible to apply patches to the FC4 kernel to get from 2.6.15-1.1833_FC4 to 2.6.15-1.2054_FC5? I could load one at a time until it breaks. And where would I get those patches? Other suggestions? Thanks, Jerry