Hey, guys! Today, I was playing my guitar with my iMac using amps in GarageBand. I was using a TRRS splitter with the headphone port to get an input for the guitar and an output for my speakers. All was working well, until all I got was feedback and nothing else. I checked all the cables, and it appears the port on my iMac broke somehow. It can receive no signal, and there's no resistance when you try and push in cables like there usually is. They just sweep in and out with no push-back from the computer. Anything I can do, or is it a goner? Think Apple will replace it for free/think they'll charge a lot to fix it? PS. no actual Apple Stores in my country, only Premium Resellers. (Humac) Thanks. Oh, and by the way - if I can't get it fixed, any suggested USB solutions?