The first obvious step is to use the D-Bad on the controller to select Restart the Xbox option and then press the A-button. If it was a minor issue, you should be able to access the Xbox Home Screen.
Qualcomm is acquiring Arduino but allowing it to operate independently. The new Qualcomm-powered UNO Q is available for $44. Qualcomm is a huge player in the SBC space, dwarfing Raspberry Pi.