Kernel panic after update to 3.5.4-1

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http://forums.fedoraforum.org – I have a Dell laptop with 64-bit Fedora 17 installed on it. I casually updated my system last night using yum. A new kernel was available: 3.5.4-1. After what appeared to be a successful update, I restarted my computer. The new kernel was selected by default and then I received a kernel panic warning: Code: 1.891663] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 1.894005] Pid: 1, comm: swapper/0 Not tainted 3.5.4-1.fc17.x86_64 #1 1.895845] Call Trace: 1.896550]  [<ffffffff81602c18>] panic+0xba/0x1c9 1.897942]  [<ffffffff81cf70 (HowTos)