You edit /etc/inittab, and change:
I don't use fedora (yet), so I'm not much help, but youmay want to make sure your /etc/fstab is correct as well. My swap reads as "/dev/hdb6 swap swap sw 1 1" and you'll obviously have to change it to wherever your swap space is set up at. Of course, this is assuming you have swap space...
Of course, check your logs (/var/log, among others) and 'dmesg' to make sure that this is truly a problem. It might be that the next thing is the real culprit, not anything to do with swap.
'man fstab' can help with the fstab file, 'man inittab' with the inittab stuff, and 'dmesg' to look for obvious problems. 'cat filename' the logs.