Specs are below. 1. I am looking for a 550W - 650W PSU. I am not very familiar with brands, just a few. (Corsair, FSP, Seasonic) $70 should be enough for one, or around that price. Could you please recommend specific power supplies? I assume new PSUs have no compatibility issues with older motherboards. 2. A totally unrelated question: one of my front panel USB ports doesn't function. What could be the problem? Thanks.