GRUB2 hangs on "GRUB Loading."

[Kim Eik]

I have been running a server for about half a year. And i have restarted 
the machine countless times w/o any problems. However two days ago, grub 
stopped working.

The machine is running ubuntu server 9.10, i have two physical disks 
mirrored with sw raid and several lvm partitions on top. The machine is 
also running ACHI.

I have booted the system using a usb pendrive with ubuntu-alternate, and 
reinstalled grub from a chrooted environment. But sadly to no effect.

I have also tried installing grub to the mbr of both disks and booting 
from each of them. Also without any effect.

I do however have a hunch that the fault may lie in a dist-upgrade from 
somewhere between my previous successfull boot and now. So i am gonna 
try to see if i can rollback some installed software and see if this 
fixes grub.

Is there anything you guuys can suggest that i do? I am not very 
familiar with the inner workings of grub2 so any help is appreciated.

Thanks
-Kim