I just installed the latest version of gentoo 3.12.4, and after I installed the grub2, no errors report. However, when I reboot the system, I cannot get into the grub. It just flash once and then restarts over and over again. There's even no hints to what's wrong. Would you please look it up? Thank you very much!
Sorry, but there just isn't enough information here to call this a bug. Please seek help in Gentoo support channels. If you actually end up finding a real bug, I would be happy to help you resolve it.
The handbook is an invaluable resource for installing Gentoo, please follow the instructions given there. :-) http://www.gentoo.org/doc/en/handbook/