Radio/nav not booting

New to the forums and now a "proud" owner of an 07 sts v. bought it off a guy who just did not show it the respect it needed. So Im now in the process of fixing it up.
I replaced the battery yesterday and when I went to start it up the sts logo on the screen just cycles, and on the dic it is in Japanese. I havent had a chance to really mess with it other than disconnecting battery and checking the fuses. Has anyone else had a problem with this? Im hoping this is just a simple/cheap fix since i already have a to do list a mile long for this thing.