kernel panic fedora 17 64-bit

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http://forums.fedoraforum.org – i was updating the system (it was almost completed, just clearing the packages) but suddenly there was a power cut and my pc was shutdown..... later i restarted and booted the new kernel, it shows kernel panic ............ i booted the previous kernel and did yum-complete-transaction, sill the same result...please help what to do??? (HowTos)