Direct input from musical instrument - will cause sound card damage?

I've recently upgraded from a 1gHz eMac to a 2.26gHz late-2009 Mac mini. Part of the reason for the upgrade was that I was having problems with audio input on the eMac, to cut a long story short, but obviously the eMac was getting unbearably slow and it was about time to upgrade.
My question is this: will recording into GarageBand with a direct line-in from my synthesiser keyboard damage the computer or its sound card?
If it helps, I'm using an external display and speaker set (obviously, being a Mac mini) whereas the eMac had an integrated display and speakers.

ShedEntertainment wrote:
....will recording into GarageBand with a direct line-in from my synthesiser keyboard damage the computer or its sound card?
It shouldn't. Electronic instruments output a voltage that is close to the "line level" that typical household audio components use.
The worse thing that should happen is that you would get distortion, if the output of the synthesizer is too much for the mac's input. If that happens, either reduce the output of the synthesizer, or put a mixer between the synth and Mac, to give you control over the level reaching the Mac.

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