Iphone 4 comes on when plugged in only?

I have an IPhone 4 (not S) that I dropped in a bucket of mop water. I put it in rice for 4 days and now it only comes on when I plug it in, but even then it only shows the Apple logo for 6 seconds then shuts off, then shows up again, then shuts off and it keeps doing that until I unplug it. What is wrong with my IPhone?

Try to charge full and if it turn on try to restore it. Or change battery. Fall of iphone inside water damages your iphone 4 board and power ic. So better change board or repair power ic

Attempt to restore it using iTunes. If that doesn't work the phone has had it.

What is wrong with your phone? You dropped it in water what do you think would happen?

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