new kernel 3.7.7 prevents booting

[Frédéric Bron]

> Is the machine actually *frozen*, or is it just not going into graphical mode?
> I'm having that problem as well, using the proprietary nvidia driver. With
> nouveau, the last kernel that let me run graphically was 3.6.11 (for nouveau the
> machine actually freezes up completely, I can't ssh or even ping it). See
> https://bugzilla.redhat.com/show_bug.cgi?id=901816 .

I can switch to a terminal with Ctrl+Alt+F2 and reboot.
I suspect that it is because the nvidia proprietary drivers were not
updated at the same time as the kernel. I has always been like that
but the issue has never been a stop with "Failed to start Wait for
Plymouth Boot Screen to Quit see 'systemctl status
plymouth-quit-wait.service' for details".
I will wait till the nvidia are updated for 3.7.7.

Frédéric