flickering screen on macbook pro
non working usb suddenly with message " To prevent damaging your computer, the USB device drawing too much power has been disabled. Other devices may have also been disabled. When you disconnect the device drawing too much power, your other USB devices will be enabled again."
this happens occasionally, I found out that it disappears when I press the body of laptop firmly (the area around the enter key). Apparently something is loose and it moves and disables the usb and/or causing the flickering. a quick fix only.
