Pardon the hiatus from the forum. When a get a day off and/or the time to open my comp again, I'll try reseating them.
Really delayed edit: I finally got around to opening my case, and found that my USB cord had somehow come unplugged from my mobo. Stuck it back in its proper place and all USB ports are working fine now. However, I'm still having issues with the mic jack on the front panel. =/