previous problem sort of resolved

[Jim]

i have Core 3 installed   i did a upgrade from core 2
when i update, up2date uses channels from core 2 not 3 
now i have some updates which i can't install because of dependancy
problems.   if i change my etc/sysconfig/rhn/sources   file, i'm told
that i need to register with RH to update.  Obvisouly this isn't a
good thing, so  should i do a fresh install keeping  my existing
partitions  or   do i change my above file, and what other files will
i need to change so i don't get the update problems...  in one of my
previous posts, i have the latest kernel installed, but in grub ( at
boot) doesn'y list the latest kernel.   See the post named  "New
kernel but doesn't show  in grub at system boot"
please review my last post to that thread.  
-- 
James Lawrence
NY