New install Jesse 8.6.0...grub2 problem

[Mark Neidorff <mark@neidorff.com>]

Hello,

I'm building a server PC to perform backups of the PCs on my local network.  
The server has 2 HDDs--750 Gb and 2 Tb.  The intention is to use the 750 Gb 
drive for the OS and the 2 Tb drive for the backup data. I'll get there in 
stages.  I'll be using backuppc to do the actual backups.

I tried using a different distro--OpenSUSE and it didn't work out.  I installed 
the distro on the 750 Gb drive (and it boots via grub2 from the 750 Gb drive), 
but couldn't get backuppc working.  I didn't want to just wipe out the 
OpenSUSE installation, so I carved a partition out on the 2Tb data drive and 
installed debian there.  

The install went fine, up to installing grub2.  The installer didn't find grub2 
on the 750Gb drive, and it reported no other OS detected.  I then selected the 
2 Tb drive as the boot drive and it errored out when I asked to install grub2 
on the 2 Tb drive.  So, I installed grub2 on the 750 Gb drive.

My problem is that when I boot the machine, it boots into OpenSUSE, and 
doesn't give me a menu to choose from.

I don't know how to proceed from here.

My question(s):
Is there more information that you need to help me?

How do I go about fixing this boot problem so that I can boot into Debian?

Many thanks,

Mark