HP claims my computer won't boot because of water damage but I have doubts- what do you think?

Sudonym

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Jun 25, 2014
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A few weeks ago my under warranty HP Pavilion Touchsmart 15-b109wm stopped working- it had got the Windows 8 blue screen of death two times like a week before this time the screen occurred again and started to get corrupted with random colors after I tried to turn it on it wouldn't boot to bios the caps lock always blinks three times meaning memory module error, the only way to turn it off is by force shutdown. I sent it into HP and got a call just today saying the cause was water damage to the motherboard so they wouldn't fix it.

I'm not surprised because my little brother spilled water like three month ago but quickly turned it upside down and wiped it off, but the computer has worked fine ever since so I really have trouble believing that could the cause. I had them send pictures which I'll attach and except one small area the water damage is pretty mild, or at least that's how it seems to me..
So my questions are:

1.Could water spilled on the computer so long ago cause this problem?

2. A lot of different things can occur when a motherboard fails some times when the motherboard fails the computer just boots and turns off or restarts,sometimes it boots and beeps a certain code, or doesn't boot at all, it depends on what part is damaged. If the specific areas of the motherboard that look like they have water damage had completely stopped working would cause the computer to not boot to bios, with a blink code of three times and remain on.

3. If this is the cause of the problem do you think it is fixable by cleaning? If the water isn't the problem do you see any other issues with the motherboard- or have a guess as to why it stopped working?
 
Think about it. If there wasn't evident water damage, how would they even know it had come into contact with water? They have no way of knowing that your brother spilled water on it, and that's not a common occurrence. They couldn't have guessed that accurately, so there had to have been visible water damage.

All it takes is one small part of the motherboard to be damaged to break the whole thing. And it doesn't necessarily have to break right away, or in a consistent way.

HP's claim sounds likely.