the same thing happened to me the other day. my USB ports went out and then one time when i tried to turn on my computer, nothing displayed, nothing beeped, just fans spinnng. i did my research, i troubleshooted, by removing parts one by one (eg. removing the RAM) just to try and diagnose the problem, and it turns out that my motherboard had copped out on me and stopped working. lately, people have been having problems like this when their gigabyte motherboards stop working. the most common sign that the end is near is the USB ports going out like what happened for me. I ordered a DFI lanparty just so i could get something reliable and i suggest you do the same. its a shame too, because that gigabyte motherboard was awsome till it blew up on me.