Sorry, I'm a gentoo newcomer, so I am totally not familar with this OS. Does USE make sense with grub ? 
 And in the building there is no error, I had grub-install done. Grub boot interface can show up , I can choose
 which OS to boot, but I couldn't boot win , what is the problem in your opinion?
   
  
  ------------------ Original ------------------
  From:  "Alan McKinnon"<alan.mckinnon@gmail.com>;
 Date:  Wed, Oct 5, 2011 11:39 PM
 To:  "gentoo-user"<gentoo-user@lists.gentoo.org>; 
 
 Subject:  Re: [gentoo-user] Why grub can't load win kernel

  
On Wed, 5 Oct 2011 23:32:10 +0800
"Lavender" <448463782@qq.com> wrote:

> The configuration of win kernel in grub.conf is like below:
>   
>  rootnoverify (hd0,0)
>  makeactive
>  chainloader +1
>   
>  It worked yesterday , but after I rebuilding grub software, it can't
> work. I don't know why, it still can boot gentoo kernel, I am
> confused,because grub only can do operations to MBR, it can not
> influence contents on windows partition. I also tried boot manually
> in grub command interface, but after showing "load stage2" it goes
> back to grub > .... I'm gonna pissed..... I have many important
> things in windows system, will someone  figure it out?

What version of grub, and what options (USE flags) was grub built with?

Any errors from the build of grub?
(check /var/log/portage/elog)

Did you run grub-install like the ebuild tells you to do at the end?

-- 
Alan McKinnnon
alan.mckinnon@gmail.com