Look at the whole mother board and make sure there are no capicators (they look like little batteries) with tiny splits or that are swelled up a little bit. I know this sounds crazy but i had a mobo that the powe rsuply went on and it damaged like 3-4 caps and they were hidden by the other hardware in the case such as a cap between cards. Also make sure all power connectors are correctly and securely connected. If that doesn't work try switching those devices between the different usb plugs and whatnot.
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