Our computers were on the 2nd floor. Except this one I'm working right now. All affected PCs are customer PCs. It won't be a big problem but if I can save them much better =). There are like 8-9 PC from medium-big companies so for them 1-2 PC loss is not big deal but you know, I'll try to save them anyway.
I suggest you pull all the parts out and clean the connectors. Flooding means dirty water. So thats really all I can suggest. Take it all apart and act like your building a new one.
Im guessing your MB is shorting because of something is making contact, like residue left over.
Yes I opened all and dismantled completely. I've put thermal paste con CPU, GPU, Motherboard microchip. Cleaned all with isopropyl alcolhol. That's a good idea. Maybe I should clean more and more something might be doing a bad contact but seems it only fails when I connect any RAM stick. It just start and stops. I'll try to get a good PSU to test and discard and if possible any RAM stick.
Frag, normally the correct emergency response would have been a thorough dis-assembly, drying, cleaning (after powering down of course). And then let the parts sit for 24 or more hours in hopes that all the moisture was gone. The thing with flood water is that it is contaminated not only with what falls from the sky but also the muck that it picks up along the way in the course of flooding your building.
After that, you're best bet is to try and salvage as many working components as possible to re-assemble as many PCs as you possibly can. It's likely that you'll find multiple electronic components from each PC that are ruined beyond recovery, but you may be able to salvage some things from every one of them.
I'm speaking from experience here. We had a big flood at a plant I ran in MO, and we had to deal with the exact same thing you are now. Big lesson learned here; always store all servers and work station PCs at least 48" off the ground.
Yes, since flooding already 1 week passed, and the computer was cleaning and drying with help of air conditionning for 3 or 4 days. After that I cleaned everything with isopropyl alcolhol.