How to fix the volume on a Macbook Pro

Hello, Apple afficionados.
I've been having an issue with my laptop recently and am wondering if any of you would be kind enough to help me (yes, I acknowledge that I may end up having to bring my laptop in for a technical repair.)
I have, I believe, the latest MacBook Pro, the 2011 version. 15'
This August will make two years since I had it
Last December or early January, I removed the headphones from the audio jack and noticed that the speak icon in the upper right-hand corner has greyed out. Whenever I press F10, F11, or F12, a circle-with-a-line-through-it appears. Whenever I place headphones in, the volume returns.
I had one friend tell me to look into the audio jack and see if there is a red or green light. I see no light at all; it is just pitch black in there.
A while ago, when I would remove the audio jack, the volume would be gone for a few minutes, but then it would return, to where I had normal volume and did not need something plugged into the audio jack to have audio.
Another friend suggested that I access the Activity Monitor and Force-Quit the core audio. That has not worked either.
I'm not sure what to do, and any help would be greatly appreciated!
Oh, and as of 3/12/13, my operating system is Mac OS X Version 10.7.5. I have a 2.3 GHz (GigaHertz ?) Intel Core i5. Also, I have a $ GB 1333 MHZ (MegaHertz?) memory. All software is up to date.

It didn't help
I found something, however. If I click "System Preferences", then "Sound", and then "Output", when my headphones aren't in the audio jack, under "Name" it reads "Digital out" and under "Type", it reads "Headphone port". There's no sound. However, when I plug in my headphones and select "Use audio port for: Sound Input", the volume comes out normally, as if there are no headphones, even though my headphones are plugged in. The sound comes out normally. Hopefully, that doesn't sound confusing lol.
If i can't truly get my Mac's sound back to normal, then I'll just plug in my headphones and select to use them for sound input. If I select "Use audio port for: Sound Input", the music transmits through my headphones.
Oh well.
Thanks for your help, though, sanjampet

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