So I went on vacation to Florida this week, I come back, start up my iMac, plug my headphones in, only to hear audio to come out of my iMac's speakers. I called apple, and I did the whole restart and hold down command, option, P and R and still nothing, I have apple care and he said I should talk to small dog. I called Small Dog gave them a description and said they would have to send it to apple because my logic board might have issues. My question is this... Since my normal headphones don't work, would a pair of USB headphones work as a quick fix until I could send it away?