I've been having problems with my iMac (Late 2009 model) recently. A few months ago I remember I plugged in my guitar so I can record music via Garageband, and it worked perfectly. I changed the all the settings and I was good to go. Then, awhile later, I try again. This time without ease. I ignored it for awhile, until my headphone jack stopped working as well, and I can't seem to use that either. Everything seems to be breaking on me, but my wi-fi doesn't work at all either, nor does my cd drive (though it takes most CDs, some will eject and I'll have to try putting them in a few times.) I'm really not sure what the problem seems to be, and was wondering if anyone knew what the heck is going on?