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if your tv has a glow that means that all the boards are powered up. try replacing your logic control board. logic control board controls sound, picture and the osd menus.

take your laptop apart, find where the liquid spilled and clean all the corrosion with isotropic alcohol. then test it out.

check the fuse on the lcd panel's logic board.

it is kinda hard to do. yo need to take all the keys off carefully and get to the contact points, it will look like a plastic film with traces on it. look for faded and open traces and use conductive pen to fix the traces. http://www.all-spec.com/products/CW2000.html

try spraying it out with contact cleaner and inserting the headphone in and out.

open your imac up. trace back from your power switch to where it is on the motherboard. use tweezers to jump the contacts to switch on your power. this is the cheapest way to solve your problem. if your have some soldering skills you can solder a reset switch from a old pc.

reflow your video chipset with no residue flux and a high temp heatgun.

if you get a blank screen on a slider phone it is probably cause due to a broken flex ribbon cable connecting the lcd portion to the base of your phone.

sounds like your southbridge chipset is having problems. in order to correct problem you need to have someone reflow the chip. you can try doing it yourself with some flux and a heatgun.

fuse on the lcd is open