When I turned on my Surface 3 today from power off (not sleeping) the "Surface" name was displayed but the "rotating dots busy indicator" never shows and the boot hangs. Long press on the power button can be done but retrying doesn't work. I've since gone into the BIOS settings but there doesn't seem to be anything there that might be used to figure out what's going on. It doesn't seem to matter if the keyboard is connected or not. Any ideas???