Most likely you have your monitor/display options set to an external/secondary display. Once the Lenovo logo appears and then fades back to black, with the power button still flashing, press:
***Fn(hold) + F10(tap)***
This function switches between display options. If this fixes the problem and you are not able to interact with the login screen with the touchpad, simply press
***Fn(hold) + F6(tap)***
This function disables and re-enables the touchpad
Really hope this helps anyone still in need of a fix for this very annoying issue!
Cheers!