dv8000 won't boot new info

[Neal Becker]

I'm struggling to boot various Fedora kernels on my new hp dv8000.  I
learned something very interesting. 

Install from FC4 -> boots OK
update to any FC4 update kernel -> hangs 
ACPI: Ssubsystem revision 20050902

Install FC5T1 -> boots OK
update to newer 2.6.15 from rawhide -> hangs
same result as above.

Conclusion:
It's _not the kernel version_ that's the problem.  It's the installer.

Kernels installed by anaconda work.  Those installed by rpm -i don't.  (I
have tried others also).

Question1: What could be the problem?

Question2: Can I somehow run anaconda's kernel install manually to update my
kernel?