Brand new Mac Mini - I got it to use as a network media player. I spent the whole day setting it up with Plex and my Ipod touch as a remote, reading video, music, and photos off my network attached storage, and I go to do the LAST STEP - which was what I was advised by Apple Support on the phone to do: plug a headphone jack from the two audio inputs in the back of my surround sound receiver into the 3.5mm headphone jack of the Mini - I got it close to the Mini and got a BIG shock. The Mini headphone jack glowed red and the Mini would not boot! AAAARGH! There is nothing wrong with the cable or the receiver, either, because I can plug it back into my TV or my Ipod and play stereo sound out the receiver. I know, why didn't I just use HDMI. The answer is that neither the receiver nor the TV is new enough to have HDMI. I thought I'd start with the mini and once we recover financially from that, get a new receiver and new HD TV, but one thing at a time. If I had only done one time machine backup after I set everything up and before trying to plug in that jack, I wouldn't have lost a day's work. I think the Mini had some electrical problem because that's not normal. Made a genius bar appointment for 7am tomorrow. SUCKS!!! So disappointing. I wanted to post this because googling the problem I don't see many others seem to have had the same thing happen.