The startup manager loads but cannot display, all i get is a black screen and a message saying No signal

I have a mac mini that was just assigned to me to set up for my team at work to use when they are helping customers who have a mac.  We need to have OS 10.8 and 10.9 on separate partitions, which I have set up.  However when I launch the startup manager (holding option during startup) i get a blank screen and a message saying No Signal. I know the Startup manager has loaded because I can use the arrows to navigate blindly and I can successfully load either partition. I believe that it is a resolution issue.  The monitor I have available can only display in 1440X1080 at 75 hz and I think that the startup manager must be loading at a higher resolution than this.
I have tried clearing P-ram and have searched ceaselessly to find someone who has had this same issue and no one else seems to have it.

I think the Startup screen is 800*600 normally, can you set the Startup partition in Sys Prefs>Startup Disk?

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