This started after some kernel trouble that I left alone for a while. I had miscompiled a kernel then tried to re-compile it and started to organize a list of boot options in grub for differently configured kernels and vbox threw a fit so I left the computer alone for a while.Booting it back up now I get 1 of 2 different error messages.grub loading stage 1.5error 17/18orgrub loading stagerrorI'm running Gentoo 64bit and I have been updating it through a chroot environmentThis is on a 2TB drive that I have 1.08TB used that I can not back upthough I have a tar image of the rootpartition layout is as fallows1    50GB    EXT4    /        10GB   Used    40GB  Free2    1950GB  EXT4    /home    1.08TB Used    800GB Free
MBR is toast or at least Grub is
linux;boot;grub;gentoo;chroot
It's hard to say what exactly vbox threw a fit means, but according to Gentoo Grub Error Collection, error 17 is Cannot mount selected partition, and error 18 is Selected cylinder exceeds max supported by BIOS. Looking at How to fix GNU Grub error 17?, it looks like this can be caused by a broken GRUB installation, which isn't entirely unreasonable if you have been working in a chroot environment. grub loading stagerror (or something similar) also would seem to point in such a direction.The first thing that I would try is to simply reinstall GRUB. Boot with a rescue CD, mount your root partition, chroot into it, and then reinstall the boot loader. That last part might be as simple as:# grubgrub> root (hd0,0)grub> setup (hd0)grub> exitMake sure that the device specifications are correct.