Inspiron N5040 - No Power

Good evening, I have an Inspiron N5040 laptop (A Friends) which unfortunately got wet during a Flash Flood incident at the weekend.

On discovery, I removed the Power lead and Battery and stood the Laptop on end (Allowing water to drain off) and kept it in a warm place for 3 days to thoroughly dry out.

I attempted to power it up today but unfortunately I have no life at all. (No lights on the front, No Beeps, No Life)

I have tried this with the Battery in and mains only. I have left it plugged in to mains for a couple of hours to see if charging resumes but nothing so far.

I can detect no power from the Power supply line with a tester but the battery was fully charged just before the incident.

I suspect the water has caused a major hardware failure but could you advise if there are any form of protection that needs checking first? (ie Internal fuse?)

Thank you.