F17 to F18 via FedUp: All tty output seems broken

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http://forums.fedoraforum.org – I used FedUp to upgrade an old Dell Inspiron 8600 laptop (2Gb RAM, 500Gb SATA) from F17 to F18. FedUp seemed to work fine, but, after the final process finished, and I tried to reboot using the new 3.7 kernel from the GRUB2 menu (which works as expected), all I could see was a white screen with a few thin vertical lines. When I rebooted using one of the F17 kernels that FedUp hadn't removed, the X-server did not start. However, the normal boot messages (I don't use the rhgb linux-line option.) were displayed, but the X-server failed to start. It that point, I could do a Ctrl-Alt-F2 (etc.) t (HowTos)