Fedora Requirements states that for Fedora 18 you should have:
- a CD or DVD drive, and the capability to boot from this drive.
- a 400 MHz processor or faster
- at least 1 GB of memory (RAM)
- at least 10 GB of permanent storage (hard drive) space.
This is the
minimum needed to run Fedora 18 with a GUI.
You have not stated your RAM, but it looks fine.
After a bit of Google-Fu, I found that iBooks with that processing speed had between 128 MB and 256 MB standard RAM.
If this is the case, then a much earlier version may be required; sorry.