Input Jack Noise Problem

I am attempting to record records with my eMac. I have a turtable hooked up to a pre-amp. I am getting noise at the y-cable that is RCA jacks on one end, small stereo jack at the other. I plug this into the input jack and I am getting a cycling popping sound. Discussions on a record forum suggest that the input jack is set up for recording microphones and is too sensitive for "line in" type sound.
I have gone into my system preferences and adjusted the input volume down, but I am still getting noise.

Which HD do you have?
1. There is a constant noise from it and by
monitoring the fan sensors it have concluded that
they are not to blame. Altough it sounds like a fan
that is constantly on because it sounds like air
flowing inside the computer. As far as i can tell the
noise seems to be most apparent under the trackpad.
This noise is on from the moment i turn on the
machine until i shut.
It might just be the sound of the hard drive spinning. They don't appear to ever spin down. Especially the 7200 one like I have.
2. I belive or am imagining to my self that the
harddrive is becoming louder when writing/reading
activity.
It not just your imagination runnin away with you. On occasions mine makes some clicks, etc. when reading or writing.
So from these two issues i tought it migh have been
the harddrive that had some fault on it, but i cant
seem to find any, the S.M.A.R.T. status is verified
and there is never any sounds which might suggest bad
sectors on it.
I think it just may be "normal" for these drives.
3. Every 2-3 secconds there is a faint noise from the
PowerBook and i belive that this might have something
to do with the Power as when it is not pluged into
the mains there is no sound. It sounds like a very
quite heartbeat monitor.
No clue what that is.

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