I had this same bumfuzzleness. My Galaxy 8 phone did not get wet AT ALL and was not splashed but it did go dead completely. I plugged it back in and got nothing but this water droplet icon and electrical plug error icon. Very frustrating when this is my only phone for work. I tried the hairdryer with no luck. The solution that worked was hold down the volume button and power button at the same time and plug in the cable. It came back up and is charging now. Thanks to Firestarryl for posting that solution.
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