Power Button Not work after Water and repair

The Background:

I had an iPhone 3G for a year, no problems... Got the iPhone 3GS the day it came it out. One week later, I went swimming with it in my pocket. I shut it off. Disassembled it, dryed it and parked it in some rice for over 48 hours. Reassemebled it, restored it, and it worked great, EXCEPT for the power button. With the 3GS, I could turn it off by holding the Home button, and turn it on by plugging it up to charge or sync. No biggy.

The Problem:

I thought I just needed a new power button. Ordered the past last week. Just installed the whole ribbon cable (Power, Headphone Jack, Mute, Volume). Everything works EXCEPT the power button! I've cleaned all the connectors, checked everything I can check. Nothing seems to effect it.

Side Note:

My old 3G went to my wife, she dropped it in the sink for a few second, so as precaution, I took it apart, dried it and riced it. After assembly, it worked fine, until a month ago, when its power button went out. What is going on?

Could a drop somehow effect only the power button function on the main board?

Are the 3G and 3GS power, headphone, mute, volume cables the same? I ordered for a 3G and 3Gs and may have mixed them up.

HELP!