Line in suddenly not working

Hi there,
I'm running an early 08 13" Macbook, I've always used my guitar into the line in to record ideas, using the Garageband amp models. Suddenly this doesn't work, I bought a new adapter and still nothing. Not even a hint of signal. If I'm in the audio menu in preferences and I plug or unplug the adapter there is a slight, sudden rise in signal but no signal after this.
Any ideas?
Thanks.

try zapping the pram or do a power manager reset
Zap pra= commandoption+pr held down during start up for two chimes then let go.
power manager reset= remove battery and ac power hold down power button for 5 seconds.
Message was edited by: Smokerz

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