How to boot Fedora ISO with grub2?? thx

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Is it on your hard disk, or an external medium (DVD, USB stick, etc) ? The best way will be to load it onto one of the latter, and then select it in boot device selection: http://www.computinghelp.info/wp-content/uploads/2010/08/initial-pc-startup-screen.jpg (boot screen)

http://docs.oracle.com/cd/E19962-01/html/821-1089/figures/f8_boot_menu.png (boot device selection)

To add the image to the device, see here (currently not enough rep for links: http://docs.fedoraproject.org/en-US/Fedora/14/html/Installation_Guide/Making_USB_Media-UNIX_Linux-other-dd.html