I'll let others deal with your other questions, because they require
some thought and I am not sure if I remember enough of the re-install
process to deal with it. But, a few comments that I hope may be
helpful:

On Sun, Dec 21, 2008 at 04:41:15PM -0500, Jeff Cranmer wrote:
> (4) After editing the make.conf file, verifying that it is correct for a 64 
> bit system, I then can run the command
> emerge -e world, and everything should compile correctly?

backup /var/lib/portage/world before re-installing. This file contains
all of the packages in your world. I am not sure if the stage3 tar
ball will overwrite /var/lib/portage, so better be safe than sorry. 

After your re-install you can just cp the world file back and issue
emerge -e world. On older portage, sometimes one runs into weird
circular dependency problems. The newer portage versions maybe able to
resolve it on its own, but I have not tested it to see. 

> (5) With this method, I will not lose any other key settings such as video, 
> kde etc.
> Is this correct?

Suggestion: backup /etc and /root before re-install. Ditto /home if it 
is not on a separate partition (and if so, why is it not on a separate
partition? Data should be kept separate from system). Everything else
you can recover from the re-install. 

Hum, you should also backup /usr/src/linux/.config, if you don't have
a backup already sitting in /boot. That will save you some time
building your new kernel. 

HTH, 
-- 
Willie W. Wong                                      ww...@math.princeton.edu
408 Fine Hall,  Department of Mathematics,  Princeton University,  Princeton
A mathematician's reputation rests on the number of bad proofs he has given.

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