Came back from vacation and 2003 Vibe GT wouldn't start, no instrument lights or buzzer when key was inserted. Went to jump start and as soon as connection was made the horn and headlights came on, each time. Hooked charger up, dead battery began charging ok (no horn or headlights). Tightened a loose battery cable and fully charged battery and now car acts dead except horn and hazards work, no dome light, headlights, instrument lights, hatch release, starter. Have power to fuse box under hood, wasn't able to check fuse box under dash yet (could they have made that more inaccessible).
Haven't found if there is a main fuse or fusible link somewhere (if so where is it?), but power to that panel makes me think maybe not. Any help is appreciated, thanks!