preupgrade 16 hangs after boot

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http://forums.fedoraforum.org – ok, my first major upgrade and I chose the preupgrade path (i also tried preupgrade-cli). The system downloads the version 17 and then I reboot the server to "upgrade to version 17" (after grub loads). Then another 20 minutes when it updates 1466 packages. I "think", I come very close to the end of installation where the whole system hangs/freezes (some times at 'NFS', sometimes at 'started login screen'). And no graphical display etc. However, 1. I can press ctl+alt+F3 and see a login prompt where I can login just fine (whereas system hangs at ctl+alt+F1). 2. (HowTos)