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At this point I am not sure if you can be able to here sound from any of your installed players like Windows media player or VLC or anything like that. Well if you can not here any sound coming from the computer from any of your players, then there must be a problem with the sound or audio drivers on your computer. They might have been deleted or altered in some way. You just need to go to the website for the manufacturer of your computer and download the audio drivers that are compatible with windows 8. But if you can hear sound from other players except Itunes, then I suggest that you uninstall and re-install Itunes on your computer. The case might be that the Itunes was installed with a few errors and this might cause problems like what you are experiencing now. Re installation might work
Check if there is any sound coming out of the headphone (using headphone and playing itunes). If there is none. Goto System Preference > Hardware > Sound > Output ; check if the output is assign to internal speaker and it is not muted. Do a visual check at the headphone connector, look into it, see if you see a red light emit from the headphone jack (indicate that the fault is in the headphone connector, it's trying to output optical spdif).
check your preferences in the apps. Do you have headset plugged in?? there are sound options in yahoo messenger preferences, check those first, as well as your system preferences sound settings. sometimes, its just plugged into the wrong input, and/or not set to hear/talk with a headset.
it sounds like EZ A C did not get the audio or EZ put it in a format tha Itunes Cant play. download VLC media player and install it. open the file with VLC and se if it will play it. It will play just about anything it has most of the codex's need to play anything too. if it doesent play it then something is wrong with the input to EZ A C you might have the input muted.
Hold the power button down. Keep it down until the unit powers off. Then press power to start the machine up, and as soon as you hear the starting chime (boooong) press Command+Option+P+R and keep them held down until you hear the startup sound 3 times. Then you can let go and it should start normally.
I hate to break it to you, but it sounds like a hardware issue. Have you tried going into System Preferences yet? If not, go to System Prefs>Sound>Output tab and then check the speaker balance. If the slider is in the middle, then it definitely sounds like a hardware issue.
I'm going to guess you've had your MBP for a while now, which would mean that something inside like a speaker wire could have gotten knocked around enough to just fall off, or loosen a connecter just enough to make the speaker not work. That is, of course, if it is not System Prefs. Let me know how it goes.