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Check this thread<br />
<br />
<a href="http://forums.macrumors.com/archive/index.php/t-237405.html" rel="ugc">http://forums.macrumors.com/archive/index.php/t-237405.html</a>
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Check this thread

http://forums.macrumors.com/archive/index.php/t-237405.html [http://forums.macrumors.com/archive/index.php/t-237405.html]

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The internal output is for your macbook speakers when you plug in headphones the sound preferences should change to as below. If it doesn't check that you're plugging the headphones into the headphone socket and not the microphone socket by mistake.<br />
<a href="https://filedb.experts-exchange.com/incoming/2009/07_w28/157690/Picture-6.png" target="_blank" class="file-inline" title="sound prefs (45 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Picture-6.png</a>
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The internal output is for your macbook speakers when you plug in headphones the sound preferences should change to as below. If it doesn't check that you're plugging the headphones into the headphone socket and not the microphone socket by mistake.
Picture-6.png [https://filedb.experts-exchange.com/incoming/2009/07_w28/157690/Picture-6.png]

Picture-6.png

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He's got the infra-red light ... headphone/speaker jack only.
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He's got the infra-red light ... headphone/speaker jack only.

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<div class="content wysiwyg-content">
I tried switching headphone to internal output device in sound but there is nothing else to choose. &nbsp;The red light comes on after I unplug the headphone. &nbsp;Is my only option going to the Apple Store and how much is this going to cost me to blow air in the hole.<br />
&nbsp;There is a white circle with a slash through it at the bottom.<br />
<a href="https://filedb.experts-exchange.com/incoming/2009/07_w28/157485/Picture-4.png" target="_blank" class="file-inline" title="This is the picture I get when I push the volume button on my keyboard. (21 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Picture-4.png</a>
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This is the picture I get when I push the volume button on my keyboard.

Picture-4.png

I tried switching headphone to internal output device in sound but there is nothing else to choose.  The red light comes on after I unplug the headphone.  Is my only option going to the Apple Store and how much is this going to cost me to blow air in the hole.
 There is a white circle with a slash through it at the bottom.

Macbook

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.

Apple Hardware

A home theater is a theater built in a home, designed to mimic (or exceed) commercial theater performance and feeling, more commonly known as a home cinema. Today, home cinema implies a real "cinema experience" at a private home. Components and attributes include home cinema, backyard theater, home theater in a box (HTIB), audio-video (AV) receiver, front video projector and projector screen, home theater (PC, HTPC or media PC), media center, and switchable projection window.