How to unbrick a non responsive Gio

I downloaded ROM Manager today onto my Samsung Galaxy Gio, and after several attempts to back up my ROM in its current state I tried to reboot my phone into recovery mode through the app. It immediately died, and responds to nothing I do. I've tried booting it various ways, yet it remains as dead as a battery-less phone (no, charging doesn't do anything, although my battery was low at the time). The phone has been quite stable up till now. I don't have a custom ROM, it is rooted, and everything else is backed up. Is there anything I can do that will work?