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a CD is an output device that can be used as a storage or input device
Computers normally have a 3.5mm jack socket as an audio output. Most stereo systems have phono (RCA) connectors for signal inputs. To connect a laptop to a stereo system you will need a 3.5mm jack to RCA lead. They can be purchased in most electronics stores or on line. Most audio systems have a selection of inputs. If there is a choice, you can use any input that is marked "aux", "line in", "CD", "DVD", "Tape". If there is an input marked as "phono" that will be the one input that you cannot use successfully.
There are two standards for high-quality named DVD-Audio (DVD-A) and Super Audio CD (SACD). Players for both types connect to a receiver via a 5.1 channel analog input. So these 7.1 analog inputs are mainly aimed to be compatible with players of those formats. If you want to transmit 7.1 digital channels to a receiver, you can do that over the HDMI input. You don't need a special audio-only input for that, which is why there is no digital 7.1 audio input standard. HDMI is effectively that standard.
Insert the OS install CD or DVD. Restart your Macbook Pro and hold down the C key. The Mac will boot from the CD or DVD. Choose "Erase and Install" if you want a clean install.
"Weird Al" Yankovic's parody of Alanis Morissette's song "Ironic" can be found on his album titled "Bad Hair Day," released in 1996. The specific track featuring the parody is called "The Alternative Polka." This album is available on CD and possibly on DVD as well, depending on the release format.