No, I don't personally know of a way to replace a PCIe slot on a motherboard. Also, the only simple way that I know to determine the damaged component(s) is trial-and-error; replacing the suspected damaged components. Short circuits, especially those caused by water, can make it tricky to determine the extent of damage. A real life example: A friend of mine spilled water or juice on her keyboard. Despite my advise to immediately replace the keyboard, she continued to use it for an additional three days, post accident, because the computer "appeared to be fine". But on day three, not only did her computer no longer boot, but it wouldn't even POST. I am reasonable certain that the short started in the wired keyboard, traveled to the USB port on the motherboard, and damaged the motherboard. Honestly I never would have believed such a thing could happen but I personally maintained her computer before the accident and I tried to revive it after. I replaced, the memory, power supply, keyboard, and I still couldn't get the computer to POST. The only thing that I didn't replace was the motherboard and CPU because it wouldn't have been cost effective.
Would you mind listing your full specs, including your power supply's manufacturer and model #? Just to confirm, when you turn your computer on, there is absolutely no sign of any power going through the system? Or is it getting power but simply no image? For example, do the case fans spin after you push the power button. If they don't, there is a chance that you triggered a fuse. I "think" computer power supplies have fuses inside of them. This is one of the reasons that I asked about specs.
!!! Important: Do not even think about replacing the fuse inside a power supply yourself. Attempting to do so without knowing what you are doing could result in serious personal injury, even death.
My other question is whether the computer is connected to a surge suppressor or outlet multiplier. Some of them come with pop-up fuses that simply need to be reset by a user controlled switch on the outside of them. You could also temporarily plug the computer directly into the wall outlet to test to bypass a surge suppressor.
If the computer shows absolutely no signs of power, then I would borrow a power supply from a friend to see if that's the cause of the issue. If that's not possible then I would buy a new one. Normally I buy items from NewEgg, but if I were buying a power supply that I might not keep, I'd most likely get it from Amazon because it's possible that they would pay the return shipping, if the need arises.
If the computer shows signs of power, but no image, then I would presume the issue is indeed the motherboard or graphics card. No big surprise as these component comprise the majority of the computer. If the CPU supports integrated graphics then you should at least see the BIOS splash screen, and be able to boot into it. Another reason why I was curious about the specs.
Addendum: I was planning on mentioning this after you listed your specs, but I might be away from keyboard by the time you respond. If you were unsure about power coming into your system, I would test the power supply. This is simple to do and doesn't require opening it up. My EVGA power supply came with a tester plug, but if yours didn't then you could use the old paperclip test (below) to test function. If you have a ECO mode, that prevents the fan from spinning until a certain level of power is reached, then you'd want to turn it off.
Antec: Is my power supply dead?: The Paperclip Test
http://support.antec.com/support/solutions/articles/1000015319-is-my-power-supply-dead-the-paperclip-test
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