I have a Dell Inspiron 2200 that I have been running via FC5, then Fc6 test2 and FC6 test3 . It works fine, at least until yesterday. Some of this post will sound familiar as I copy>pasted another post as it was sort of similar.
I did a bunch of YUMEX updates and later rebooted. The start up process all goes fine. It goes from character based to GUI, keeps going through different parts of the boot. The screen sort of changes to blue where it is supposed to go to the log-on screen and the whole thing freezes with a funky 1" x 1" block of white squiggles in the middle.I tried hitting 'ctrl-alt-F1' etc, it does not react to that. The computer keeps running because I can pull the wireless card out and the drive light starts blinking.
If, when it boots, I go to the grub process and get rid of "rhgb quiet" and change the line to say:
"kernel /vmlinuz-2.6.18-1.2689.fc6 ro root=/dev/VolGroup00/LogVol00"
it will boot just fine.