I am having the same problem - I cannot even install FC3T2. It instructs me to press enter to continue the installation and then, a scrambled screen! I have a Dell Inspiron 4000 ...
The universal fall-back for scrambled video at install is to use text mode. boot: linux text For the specific case of a laptop or other LCD monitor, the RELEASE-NOTES-en file says to try boot: linux nofb --