The power cables for SATA or IDE or anything spreads from those lines are 5V and it's not enough to power up the AntMiner.
Wouldn't that be the red cable on a 4-pins peripheral connector? What about the yellow and black ones? According to this they are +12V and ground
http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral. Could this provide an additional pair?