Hi ,
I will answer in english. It takes me less time to find out the letters on the keyboard..
I am using gentoo too.
There are several possibilities.
What i would suggest you is first download the system rescue cd: it is a great tool and it helped me a lot because it is a quite complete assistance.
http://www.sysresccd.org/
With it you can use "mc" or "nano" and have a look at your /etc directory.
With it you can chroot and emerge the tree.
Recompile your kernel and add the system rescue [SysRq button] to the kernel. Then you wont need to do a manual reset.
You wont need to reinstall everything
Serge