Fedora 13 Live CD doesn't pass the boot menu

[Axel]

Hello
I burnt the Live iso on a USB stick and I have problem when trying to 
boot. I m using a macbook pro 3,1 (core2duo based). The boot menu 
appears (allowing me to choose between boot and verify the image), once 
I select the boot entry, the screen seems to freeze, the usb drive is 
accessed a few seconds (since I see its LED is blinking) and nothing 
more happens. Is there a way I could debug this boot ?

thanks in advance.