MacBook c2d won't start after small water top right side

Hi,

Small amount of water spilled on macbook core 2d on top right side. After this immediately flipped over and turned off with power button.

After some time tried to power it on but it will not start.

I took the top case off and it was totally dry even the underside of the top case.

Is there any logic or electric component in the top case that could have been damaged or even the mainboard died too?

I would by a top case if it fixed it but how can I be sure?