I am guessing that you either relabelled or reformatted your swap partition, or are using a different swap partition than the one that was in effect when you installed. In case you haven't solved the problem, here is what I did to get rid of it: /sbin/mkinitrd /boot/initrd-2.6.23-currentversion.fc8.img 2.6.23-currentversion.fc8 The first argument is the name of the initrd image you want to create; the second argument is the kernel you are currently running (uname -r will tell you this). This will create a new initrd for the kernel you specified above (in the second argument) with the updated information. A work-around, in case you don't care to recreate the initrd, is to put resume=/dev/sdc5 on the boot line of grub.conf. Hope this helps.
