A computing device (106, 200, 300), being convertible between a laptop mode and a tablet mode, the computing device comprising: a base portion (208, 302) including a keyboard; a display portion (204, 304) including a display; an accelerometer located in the display portion configured to detect tapping gestures by a user on the computing device; a mode sensor configured to determine whether the computing device is in the laptop mode or in the tablet mode; a first physical human input sensor (116, 316) configured to, in response to human input to the first physical human input sensor, change an operating state of the computing device between an OFF state and a non-OFF state, wherein the first physical human input sensor includes a button located on an edge of the base portion or on an edge of the display portion; and a second physical human input sensor (118, 318) configured to, in response to human input to the second physical human input sensor, change an operating state of the computing device, wherein the computing device is configured so that, when the computing device is determined to be in the tablet mode: the first physical input sensor and the second physical human input sensor are caused to be disabled such that human inputs to the first and second physical human input sensors do not cause a change in the operating state of the device, and different predetermined tapping gestures detected by the accelerometer each cause a change in the operating state of the computing device from a powered-on state to a respective one of a low-power sleep state, a locked-screen state, and the OFF state, and when the computing device is determined to be in the laptop mode: the first physical human input sensor and the second physical human input sensor are enabled to change the operating state of the computing device; and the computing device is disabled from having its operating state changed between the OFF state and the non-OFF state in response to tapping gestures detected by the accelerometer. a base portion (208, 302) including a keyboard; a display portion (204, 304) including a display; an accelerometer located in the display portion configured to detect tapping gestures by a user on the computing device; a mode sensor configured to determine whether the computing device is in the laptop mode or in the tablet mode; a first physical human input sensor (116, 316) configured to, in response to human input to the first physical human input sensor, change an operating state of the computing device between an OFF state and a non-OFF state, wherein the first physical human input sensor includes a button located on an edge of the base portion or on an edge of the display portion; and a second physical human input sensor (118, 318) configured to, in response to human input to the second physical human input sensor, change an operating state of the computing device, wherein the computing device is configured so that, when the computing device is determined to be in the tablet mode: the first physical input sensor and the second physical human input sensor are caused to be disabled such that human inputs to the first and second physical human input sensors do not cause a change in the operating state of the device, and different predetermined tapping gestures detected by the accelerometer each cause a change in the operating state of the computing device from a powered-on state to a respective one of a low-power sleep state, a locked-screen state, and the OFF state, and when the computing device is determined to be in the laptop mode: the first physical human input sensor and the second physical human input sensor are enabled to change the operating state of the computing device; and the computing device is disabled from having its operating state changed between the OFF state and the non-OFF state in response to tapping gestures detected by the accelerometer. wherein the computing device is configured so that, when the computing device is determined to be in the tablet mode: the first physical input sensor and the second physical human input sensor are caused to be disabled such that human inputs to the first and second physical human input sensors do not cause a change in the operating state of the device, and different predetermined tapping gestures detected by the accelerometer each cause a change in the operating state of the computing device from a powered-on state to a respective one of a low-power sleep state, a locked-screen state, and the OFF state, and when the computing device is determined to be in the laptop mode: the first physical human input sensor and the second physical human input sensor are enabled to change the operating state of the computing device; and the computing device is disabled from having its operating state changed between the OFF state and the non-OFF state in response to tapping gestures detected by the accelerometer. the first physical human input sensor and the second physical human input sensor are enabled to change the operating state of the computing device; and the computing device is disabled from having its operating state changed between the OFF state and the non-OFF state in response to tapping gestures detected by the accelerometer.