Looping apple logo screen, messed up screen, help!

Ok, so, I went swimming 2 days ago with my Iphone5c in my pocket unknowingly for about 10 mins, I took it home, replaced the battery, there was water in the screen, I replaced the screen. I try turning on my iphone, it doesn't work, I have to plug it in to something, only then does it show the apple logo, faintly showing some sort of square things I dont know, like this:http://youtu.be/g0Wm4-Kwa20

Basically getting worse and worse till the screen is almost fully grey, it goes off straight away as soon as the power cable is taken out.

Can anyone help? Suggest anything, please. I will try to replace anything I can. Thankyou.