I have an Asus G73jh laptop, Windows 7 64-bit, etc. Suddenly, my external hard drive, my usb headset, and my ethernet cable connection are not being recognized. My usb mouse, however, is. It doesn't matter which port you plug which into. With the headset and ethernet, my computer doesn't make any confirmation sound through the speakers and I don't see any little yellow !'s in Device Manager. My external, however, does come up with a yellow ! and "unknown device." And no, I haven't installed anything or changed any settings or blah blah. Any advise greatly appreciated, thanks in advance.