blank screen during "System Upgrade"

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http://forums.fedoraforum.org – Looks like I picked the wrong day to attempt an f17->f19 upgrade... fedup-cli completed normally. Verified grub.cfg updated w/ "System Upgrade". T'was. reboot and select "System Upgrade" from grub menu. Was presented w/ a pulsing "F" and progress bar for maybe 10 sec, then the signal to the monitors went away and I'm staring at a dark screen while the system appears to be, uh, "upgrading". It's still working on it..., I have no idea what the end result will be, but I'm guess'n it's not good. First: since I'm assuming that the machine will just (HowTos)