Kernel panic while booting after upgrade via yum

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http://forums.fedoraforum.org – I had a 3.8.11 kernel which I upgraded to 3.9.2 with yum and my laptop would not boot with the new kernel. So I would boot with the old 3.8.11 kernel and waited for a newer kernel to become available, hoping that installing it would solve the problem. Today I installed the 3.9.4 kernel and it also won't boot:( The boot process stops (shortly after starting) with a text screen, the earliest line at the top is Code: [1.032622] BUG: unable to handle kernel NULL pointer dereferenced at        (null) then lots of junk, and the last 3 lines: Code: [1.033783] --- [ end (HowTos)