3gs screen not working, computer not recognizing

my iphone got little wet few weeks ago. when mean little, mean "maybe" few drops got phone through connector , couple of drops on screen. in no way submerged or that.
anyway... connected charger (i know... didn't think wet inside). started acting weird if touching screen, wasn't , kept saying device (charger) not compatible iphone. tried 2 charger cables have used before. so.... battery died , phone not power on.
bought replacement battery , installed it. powers on, screen not respond. not slide bar unlock phone.
connected computer , computer not recognize @ in either itunes or windows explorer.
motherboard shot? main concern try , photos , contacts phone. if can that, i'll happy , buy new phone.

also... when replacing battery, noticed ribbon connects motherboard think power torn/cut halfway. not sure if that. not ribbons 4,5,6, or 7 ribbon connects under motherboard little box under power button. not have number can tell.

 

from lack of response post, should assume iphone gone?
it's hard believe because turns on.

 

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