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You may have a bad power supply. Did you turn it off, or did it go off by itself? Do you hear any beeps when you try to turn it on? Those may help you figure it out. If nothing happens you need more help, like a technician in person.This may be simply the power supply, or the motherboard may be done for.
You can try booting a live linux CD or thumbdrive and see if that gives you sound. That will give you an idea if it's Windows or a hardware problem. If it's a windows problem try uninstalling and reinstalling your drivers. If that doesn't work keep searching around or just try a fresh install of windows.
The fact that the computer wouldn't turn on tells me that the liquid managed to make its way to the motherboard..and when liquid touches that it isn't going to do anything nice, especially if there was power circulating through it when the liquid hit it. The best practice when liquid comes into contact with electronics is to remove all power sources and do not turn it on unless you're absolutely certain that the components are completely dry. In the case of a laptop this wouldn't be possible unless it had been taken apart. Chances are that the liquid shorted something. When you press the power button on the laptop do the fans come on along with a POST screen? The POST screen is the first screen that pops up when you turn the computer on, white text on a black background. They're all pretty unique between computers but they usually describe things such as memory/BIOS and also are often accompanied by an audible beep. If this screen does pop up, ARE there any audible beeps? If you hit the power button and nothing happens (no fans, no POST) chances are the power supply and/or the motherboard are blown and you will need to have a technician look at it.
Plug in another monitor to it ,serial port on the side and see if it comes up on it . Antther way to tell if it just your monitor feel the bottom and see if you can tell if the hard drive or the processor fan is running
make sure you remove any static energy from your body before any hardware changes, touch the wall or something to get started. remove the power supply and install it again. also exaclty what fan is turning off after three seconds, is it the CPU fan ???? another thing is that the power supply could be weak to feed the power necessary for all your cards, this is normal, try to test a more potential power supply.