IMac G4 with no Line In, and no Soundpref.plist

One day, I simply had no more Line-In on my iMac G4. Trying to use my guitar emitted this horrible high pitched shrill in Garageband. Some tooling around brought me to the System Preferences instead of the Garageband preferences. In the Input pane, there is only the Internal Mic. Did some research, and heard everything from it might be blown, it might just be a loose connection, to it may be an account issue, or even just a Preferences issue.
Someone suggested deleting that Soundpref.plist file, and letting the computer remake it upon a restart. I tried to locate that .plist file. The oddest thing was very quickly apparent - it wasn't there. That's right, I didn't have a Soundpref.plist file. Everything else is there, but there is one extra file with an odd name that's not on my iBook with the same OS. They each have 33 files in the main Preferences folder.
To be sure I wasn't just missing it, I copied the one off my iBook. Still nothing after Verifying and Repairing Permissions. I'm going to soon check my Time Machine from that computer to see if it's there at any point in the past. Very odd issue. In my past troubleshooting, Archive & Install and Erase & Install didn't solve the problem either. I'll also try creating a new user to be sure the problem isn't just on my account later on.
In the meanwhile, any thoughts? Has this happened to anyone else?

The noise is not feedback. It actually has nothing to do with my distance in relation to the mic. It is however sort of a 'feedback' sort of noise, just not actually feedback. It is obviously not trying to go through the output. Headphones don't bypass the issue. It's a matter of not having a Line-In option in System Preferences.
I have had this problem for months. There is no simple solution I haven't tried to resolve this. To clarify, I'll list the fixes I've tried.
Tried wiggling / cleaning the jack, swapping cables, swapping guitars, checked System Preferences (no Line In), checked GarageBand Preferences (no Line-In available), tried SoundStudio / Audacity, Archive & Install / Erase & Install, restore from very old Time Machine backup, create a new user, Verify / Repair Permissions, run maintenance scripts, copy another Soundpref.plist file...
Anything I'm missing? Some setting or something simple?

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anas guellaf wrote:
it still make 3 bips before starting the IMAC.
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