I'm assembling my first AMD based system and have a ? about the power supply. The mobo (MB m805LR) has only the ATX power supply slot, yet the power supply has both the ATX connector and an additional AUX power connector. After assembling the new computer, it won't power on. I'm thinking it's because the power supply needs the AUX plugged in somewhere. I've tried using another powersupply from a working computer with no luck (it too, has a AUX power connector). I think I'll need a new power supply but hope not. Any ideas?