I do not think any damage was done from the start. But you were right to be cautious. If it was just water and over 15 days have passed, and the system runs now with no issues...sleep well you are ok. If the water had caused some sort of issue the unit would have let you know. By the way, it is hard to get water inside a PSU. You would have to pour or spray it through the fan side or vents. I guess you could pour enough over the case edges to get water to seep it but that's a lot of water. So no ghosts in the machine for you.