Installed Centos_6.4 (64 bit) but couldn't install Fedora_18 (64 bit). Any ideas?

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http://forums.fedoraforum.org – I have an old Macbook Pro 3.1 (2.2GHz Intel Core 2 Duo; 8600M GT NVidia, 2GB, 320 GB SATA) (see support.apple.com/kb/sp17 for other info). I was able to install Centos_6.4-x86_64 on it but when I tried the Fedora-18-x86_64-Live-Desktop.iso the computer failed to boot. It stopped at: 1. 2. Choose type CD-ROM: _ (blinking cursor) ...and I wasn't able to use the keyboard so powered off. I did some research on this error and found that it happened when trying to install a 64 bit OS. So I grabbed Fedora-18-i686-Live-LXDE.iso and was able to install the kernel and LXDE and everythi (HowTos)