Dim Green light on Charger after water spill

You need repair/replace whatever was damaged by the liquid. There are many potential sources of your problems and they have to be eliminated or identified as the cause.

Connect to an external monitor to see if your VGU/VGC is damaged. If no video shows up at all that portion of the logic board is dead, and you'd have to replace the board as the VGU's are fixed to the board. If you see something there your internal display chain is damaged, controller/fuse - cable or HD.

Fans going into high speed means at least one damaged sensor because the default condition for a sensor that is not reporting, or, is reporting out of range is to run at high in order not to cook the CPU. Sounds like you've also damaged at least the top case/keyboard (even though you see no corrosion) because the power on button is not working normally.

Along with corrosion also look for burned or swollen components.

You might try removing the HD and putting it in an external case, or, attempting a target (T key) boot to see if the HD is working.

Same thing with testing the battery.

If this answer is acceptable please remember to return and mark it.