Hi everyone! I'm having an issue with my tablet. I've upgraded it to windows 8.1 yesterday. I did not follow the guide of this forum (did not now there was one) but the setup ran fine and everything was working until I shut down and power it up. Now everytime that I power the tablet up I have this error message: "reboot and select proper boot device or insert boot media in selected boot device and press a key" I tried accessing the bios (by pressing F2) but it doesn't work. I've even tried booting linux distributions but my usb doesn't boot. Could you help me to find a solution please?