There's no one "kernel parameter" so I can't really tell you how to configure it. Do you see any error messages before the boot stops?
Your best bet is to search the
fedora mailing list and see if anyone else has a similar problem.
Another alternative would be to try a different Linux distribution. I recommend
Knoppix to new users because there's no setup. It's a bootable CD. If it works, then the problem's with your Fedora install. If it runs into a similar problem (keep in mind all Linux kernels originate from the
same place) the problem may be with your hardware. I've seen bad RAM hang up boots before.