If spills are covered by your warranty I’d go that route. Otherwise, I would try popping the key out with a thin flat metal object and clean the connection point with some alcohol to disengage the key and hopefully also restore proper function. If that doesn’t work you may need to map your left arrow to a different key, or if you have a number pad, 4 is left arrow if you turn Num Lock off. And yes your USB port(s) are probably shorted out and toast, which gets worse if you had an appliance plugged in and it was drawing power. Your headphones might be okay if they are “passive” ones with no sensitive power hungry tech, just clean the plug. If they are high end “active” ones, they may be toast. I’d be worried about the USB ports. Try plugging other things into them to see if they work. If at least one works, you can at least plug in a USB hub. If not, you have to replace them…

One of my air conditioners has the same issue with ice forming near the coils and requires defrosts. I haven’t figured it out yet but I can offer you some possible ideas. (1) It could be a defect in the thermostat, causing the compressor to work at full power constantly, leading to frozen coils. (2) A. Condensation or water collecting somewhere it shouldn’t. If water is near the coils it freezes. This problem then starts to compound, as the frozen coils then start to prevent air flow throughout and the chunks of ice grow larger. It gets worse until the compartment turns into a self-contained chunk of ice that must be defrosted. Checking to see if the fridge is level may help. If it sags in a certain direction that could potentially prevent water buildup from draining. (3) B. Air flow restricted somewhere or fan malfunction. If the fan is not working properly, the air will not circulate where necessary. Also, proper fan function helps prevent excess humidity in the compartment. These things contribute or...