Green
The locking cable allows you to screw on the cable to the headphones. So, for example, if you step on your headphones, the cable won't come out. The non-locking simply plugs into the headphones, much like a jack on your computer or iPod. I'd recommend the locking because you don't have to screw the headphones on.
Speaker
If you are referring to the headphones, it can be any color.
yes computer headphones will work in a ps3, turst me i have one.
Speakers and Headphones send out audio from a computer! Speakers and Headphones send out audio from a computer!
A good standard procedure for checking a possible hardware failure of this nature: First test the computer and the peripheral (headphones in this case). Plug another set of headphones or a speaker into the same jack you plugged the headphones into. Next, plug the headphones into another computer or mp3 player. This will help determine if it's one or the other that is faulty. Check ALL your volume controls. In Windows, there are multiple volume options. In your system tray, there is a speaker icon you can right-click on and select "volume options." Make sure you don't have something muted there. If you put your headphones into another computer and get sound, but you try a pair of headphones in your computer and nothign works you may have a faulty jack. Get a pair of phones you know work for certain, plug them into the computer. Do you get any hissing or intereference? If so, it is likely the computer. Try very gently wiggling the part of the headphones that plugs into the jack around while it's plugged in. Do you get static or popping sounds? It is likely the jack in need of repair if you do.
It likely that you plugged your headphones into the wrong jack. There should be a jack for your headphones on your computer that has the head-phones label on it, not the one with speakers or for a microphone.
yes
Inside your computer is something called a sound card; this is what you plug your headphones into. What the sound card does is it reads data on your computer and determines what sound needs to be played and when, then it takes a copy of the data that it has determined is sound and instantly converts it into a signal which is sent to your headphones, then your headphones convert it into sound. Simple
purple
A sleeping computer is not processing anything. Therefore, no audio.
If the headphones work on a PC in the US, then they will work on UK PCs. However if your headphones come from a cell phone, then they will not.