If you shut down the PC in time before any current could be redirected on the GPU through the water, chances should be good that nothing critical happened. It is important to let your electrical equipment dry for a longer time of period (at least 24 hours) before attempting turning it on again since you want to make sure that no fluids are left inside the electrical components.
When you say nothing happens, does that mean that the PC won't turn on at all or that you can't get a signal on your screen?
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