[Problem] Line in port giving intervalled static when recording

Hi,
My MacBook late '08, has started having recording issues when recording any instrument through the line in port. I have tried using different recording software and cables however, even when anything makes contact with the inside of the port, the static starts. If you turn up the recording level, the static 'blips' get faster and louder.
Any ideas?
Thanks a lot.

It "sounds" like you might need a preamp for the mic to bring up the input levels to line-in requirements.
Regards,

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