1. Ariesheilaon7

    USB 2 Keyboard Problem El Capitan

    Hello Good People I have hp workstation (xw6600) with yosemite 10.10.5. and I just update yosemite to el capitan. But my workstation going weird. my usb keyboard suddenly not detected. so i must re-plugged again to make it work. it happens several times and it's very annoying. I can't shut...