I use a lot of hp/compaq dc 7100 computers (These computers are second hand hardware I reconfigure for giving them for free). I already had a small problem with the boot (need to boot in failsafe mode - reported in bugzilla), but probably with no relation to the one I dicuss here.
On one computer I keep for experiments, I changed the original sata drive for a much bigger one (500Gb). I also added an IDE drive (120Go Maxtor).
The maxtor drive have a working XP install.
The 500Gb sata drive have a working 11.4 install.
However, since I installed XP on the other drive, I can’t make the computer boot openSUSE!
When I have the boot order IDE then SATA, XP boots as installed (no grub menu). When I use sata then ide, I have a “no operating system” error.
I can run the rescue system from a dvd, mount the opensuse partition (primary sdb3) on /mnt --bind sys, dev and proc, and then run yast and configure the boot loader from there, but when I reboot I have the same thing, no change visible. grub-install is deprecated.
any idea??
thanks
jdd
the forum login is buggy, it doo not return to the original page and eat my answer 
here it again
it’s nearly impossible to install updategrub from the rescue system
I removed the IDE hard drive, but YaST could not either install grub (still “no operation system” error). I guess it’s the rescue system chroot thet disturbs.
I giveup and reinstall from scratch
thanks
jdd