I have a Debian Lenny box with two hard drives in it (no dual boot; /home and /var are on the second drive). This machine was working fine until earlier this week when I ran an upgrade and restarted it. I think during this upgrade Grub got upgraded to Grub2, and now when I try to reboot I just get this:
Hitting Enter yields Operating System Not found. This is it, I can't get into the grub screen to enter the boot command or anything.
I booted the machine into the rescue environment on the Install CD, and was able to mount all the file systems and chroot in. I tried reinstalling grub2, but this did not help. I ran fsck on my /boot file system, but it appears fine. The boot partition is also marked with a bootable flag in fdisk. I did try to downgrade back to grub1.5 which, while it didn't given an error did hang shortly after it loaded.
Any ideas? I've seen quite a few threads on this, and I'm beginning to suspect that it's a hardware problem. I've had no trouble reading data off of the disks after I mounted them in the live environment, so I'm not sure. The next course of action I'm considering is to reinstall, but I'd rather check here first.