Audio line-in buzzing sound

hello guys ! i just bought a macbook last month and currently still learning on how to get used to mac.as a guitarist im very exited to try out the GarageBand.after i plug in the audio jack from my guitar to the audio line-in port,i found out that there is no sound from the strings of my guitar.there is only the buzzing sound.the input level also shows a not static level instead of steady level.what do i have to do friends ??
forgive me of my language as english is not my main language
thanks !!

Hello,
Most likely, the output from your guitar is too low and therefore sounds like silence from your Macbook. You will need to amplify your guitar output to work with your MacBook. Since you are a guitarist, you might already have the right equipment--connect your guitar to a preamp, and then to the macbook. If you don't have a preamp, I think you can plug your guitar into a regular amp, and then connect that to the macbook.
* There are two kinds of input signals, distinguished by levels. Commonly, they are called "mic-level" and "line-level." Most guitars pickups will output mic-level, which needs to be amplified to line-level to work with computers. MacBooks only accept line-level inputs.
http://docs.info.apple.com/article.html?artnum=303722
http://en.wikipedia.org/wiki/Line_level
I have used an acoustic guitar w/ preamp with Garage band on macbook, so I can tell you that it definitely works.
Rock on!

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Audio line-in buzzing sound

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