Hi, I have bought a second hand Surface Pro. However there is an issue with the Surface Pro: the orientation sensor doesn't seem to work, so when I rotate the Surface the screen doesn't rotate with it. The Surface Pro is installed with Windows 8.1. I've tried the following: - I've searched the forums, someone suggested to press Volume+ and power button simultaneously, which sort of resets it. I was told it is supposed to reboot itself twice. So I did, I pressed Vol+ and power, the unit did powered down and then powered back up. (I was told that I should keep pressing vol+ and Power at this point, until it reboots again) However it just freezes there. So I had to let go of the buttons, and powered on the Surface again again but nothing seems to change. The screen still doesn't rotate. - I tried testing the sensors by downloading the Sensors Troubleshooter (http://go.microsoft.com/fwlink/?LinkId=267763) NONE of the Sensors can be detected, so I tend to believe its a software/driver issue rather than hardware. - I tried to restore the Surface to its factory settings. I took a look at the partitions in Administative Tools. But all I see it a 300MB parition, and the rest of it is the Windows 8 Partition. So I assume the seller has wiped off the recovery partition. - I then tried to install the Surface Pro from a USB drive. I tried to restore Windows 8 from a USB Disk (In Control Panel -> Update and Restore), however when I inserted the USB Drive containing Win 8 setup files, Windows keeps prompting me the USB Flash does not have the necessary files. The USB Drive is created with the Windows 7 USB download tool + win8 ISO image I have downloaded. So at this point I am pretty stuck and perplexed. Does the Surface Pro require a different set of installation files? Do I need to install extra drivers? I looked in device manager and I don't see any exclamation marks at all. Any advice is greatly appreciated, thanks!!!