Hi there Colin and welcome
Where exactly was the water spilt on it?
Ok, the mainboard or power supply has shorted out then Colin, I strongly urge you not to turn it on again for fear of electrocution
Your only economically feasible solution is to get a replacement power supply here and replace this
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Only then do you know if it is the power supply or the mainboard thats at fault as if it still does not work after replacing the power supply, then its the maiboard and this it is not feasible to replace as the cost of replacing it would exceed the value of a new PS4.
But in this situation, these are the options you have sorry.
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.
Its not possible to send to me sorry, but for the amount the power supply costs I would say it is worth the risk as the buzzing points to a failed power supply.