Are you sure the power leads are red&black ? Check your manual for the color codes of the front panel wires, if they are not listed....... trace the wires back to the switches/leds/speakers.
My speaker wires are red& black, my power sw. wires are black& white.
I would think the color codes would be standard , especially for an Antec case.
This link shows the typical front panel connectors. If you look at the 2nd picture( click-on it to enlarge), you will see the only connector that has more than 2 pins is the 'speaker' connector. That is why I said your power sw. connector should only have 2pins, they should also be labeled.