Audio input issue - No stereo... Right channel only.

Hi
First to thank you for taking the time to read and consider this if you do - any help in this would be hugely appreciated
Ok - I'll try to make this as concise as poss but it needs some explanation:
I'm home-recording hobbyist musician. One of the things I would very much like to use the iMac for is to back up old four-track tape recordings, recording them as wav or mp3 as the case maybe and saving them to my hdd. Easy right? Apparently not, so far... let me explain:
On the tape recorder there is only an RCA stereo out (red and white, left and right). The very first thing I did when I got the iMac was download Audacity (the audio software), hooked up a stereo lead to the RCA outs on the tape recorder, and ran it into the line-in port on the iMac, using the 1/8" jack.
Now, sound came in, but only the right channel. The left channel was completely dead (ie when I panned the audio to the left, or if there was a sound in the mix that was only in the left channel, it was absent).
Since then I've bought Logic Pro and and an audio interface and this presents the EXACT same problem... Nothing in the left channel. (please note, I am aware you can "fake" stereo by setting a channel-strip to "mono" so that there is sound on both sides, but get this - it only splits the right channel in two - so you still don't have the left channel or genuine stereo signal frustratingly)
It should be noted that stereo sound is not a general problem on the system. Stereo output is perfect (ie on itunes, cds, online etc - or if I'm using softsynths in Logic for instance) it is solely an AUDIO INPUT issue.
Needless to say I've explored all options in sys prefs to no avail.
It should also be noted that I have also tested the actual output of the tape recorder and used the same leads to line into a home stereo system no problems.
Does anyone have any idea what I'm talking about or how this could be resolved? I am even open to suggestions for peripheral equipment, sofware additions etc - any questions at all, just ask.
Thanks again, any input would be welcome.
EDIT: I also posted this in the general iMac forum. Posting here for people w specific audio knowledge thanks!

Pancenter, thanks once again.
Sorry about delay replying - have had an internet outage here just to add to my woes haha.
Anyway, the good news is that I think I've cracked it:
After updating the OS per your suggestion, uninstalling both Audacity and the m-audio (profire 610), and lastly resetting defaults on sys audio midi prefs I was still experiencing this problem - just on a line-in to Garageband. Pure frustration.
So eventually I just elected (in lieu of chucking the hardware out the nearest window lol) to do a cold re-install of the OS (erase and install option, backup hdd done). As I bought the iMac in January the OS is 10.5.5 I think.
After install, before doing anything else at all, I opened Garageband, set up an audio track and set input prefs to Line in Stereo 1/2 etc, and hooked up the tape unit via rca and the line-in port. The result? Perfect 2-channel stereo.
My personal theory is that the problem was created by the audio interface installation - an m-audio "profire 610" - Tho Audio interfaces are a frickin minefield anyway between Macs and PCS, chipset compatabilities, dodgy beta drivers, worthless gadget-hawking etc etc... I also realised that while my first original attempt was on Audacity I had already installed the profire unit just immediately before (but didn't use it). I doubt it was Logic which is designed specifically for the mac - I feel this theory might be proven when I reinstall these.
So there you go - get the Audio interface right it seems.. And I've got stereo audio.
Thanks for your help and input Pancenter - much obliged.
Peace.

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