Strange (to me) boot

[mischa falkenburg]

Hello All,

I just finished installing Studio 10.10-alternate-i386.iso on this box 
that already has Xubuntu 10.04 installed.
Disc ejected, and system went into reboot.
Instead of seeing a Grub screen with a choice of which to boot, I was 
shown :
grub>

Hitting Enter resulted in a pile of commands that I admit I don't know 
"what" to do with.

I'm assuming that my problem will have something to do with differing 
versions of Grub, Yes?

Help would be appreciated.

Thanks,
Mischa