screen not working after it got wet

Hello, I sprayed my mac while giving my son bath- the hose went crazy, and yes, I knew immediately- not a smart thing to do. It continued working with some flickering for a couple of days, and 2 days later, I shut down the computer and restarted, it is completely black. I am lucky I have an extra screen to attach or I wouldn't be able to look at anything. ;( Any tips? Or do I have to replace the whole screen? There are no other warning signs that I can see, and though the computer works slowly, it has since the last year.