我的fedora live22的iso启动不了，u盘是ntfs,映像是fedora.iso，两个Ubuntu也是有时一次就启动就成功了有时要启动好几次才能成功，显示Starting Version 219和ACPI什么的相关的两行后，如果屏幕不会全暗那么就无法进入系统，如果屏幕会全暗那么屏幕会亮起继续启动进入系统，机器是三星的N150，是不是我的GRUB2的配置文件有问题呀？
menuentry "启动Ubuntu Gnome LiveCD模式" --class ubuntu {
insmod ntfs
set root='(hd0,1)'
loopback loop (hd0,1)/ubuntu.iso
linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=/ubuntu.iso locale=zh_CN.UTF-8 noprompt noeject splash quiet
initrd (loop)/casper/initrd.lz
}

menuentry "启动Lubuntu LiveCD模式" --class lubuntu {
insmod ntfs
set root='(hd0,1)'
loopback loop (hd0,1)/lubuntu.iso
linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=/lubuntu.iso noprompt noeject splash quiet
initrd (loop)/casper/initrd.lz
}

menuentry "启动fedora LiveCD模式" --class fedora {
insmod ntfs
set root='(hd0,1)'
loopback loop (hd0,1)/fedora.iso
linux (loop)/isolinux/vmlinuz0 root=live:/dev/sda rootfstype=auto rd.live.image rd.luks=0 rd.md=0 rd.dm=0 iso-scan/filename=/fedora.iso locale=zh_CN.UTF-8 noprompt noeject splash quiet rhgb
initrd (loop)/isolinux/initrd0.img
}

menuentry "启动debian LiveCD模式" --class debian {
insmod ntfs
set root='(hd0,1)'
loopback loop (hd0,1)/debian.iso
linux (loop)/live/vmlinuz1 boot=live iso-scan/filename=/debian.iso locale=zh_CN.UTF-8 noprompt noeject splash
initrd (loop)/live/initrd1.img
}