screen goes black in fedora 20 live cd

[Fatemeh Mehdizadeh <mehdizadeh.fatemeh@xxxxxxxxx>]

Hi all,

I want to use live cd of fedora 20 but when it boots up suddenly it's screen goes black.

I search about this and do the following steps:

1. In /etc/default/grub, I remove "nomodeset"
2. grub2-mkconfig -o /boot/grub2/grub.cfg

3.reboot

Now my system is very bright and nice but just for some minutes! After some minutes the screen goes black. when I add nomodeset I don't see black screen but in live cd I see it. Also with nomodeset it can't recognize my graphic card(radeon).

Thanks.

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