Things to try:
1). Try to get into safe mode (start at Step.2) and if you can go to Troubleshoot > Advanced > Startup repair and follow the prompts.
2). Start the laptop and press the Novo button and check that you get a display and can get into BIOS. If so this proves that the hardware for the display is working and that it most probably is a software problem.
3). Try connecting an external monitor to the laptop’s HDMI port. Even a TV can be used as an external monitor as long as it has HDMI inputs and you have the appropriate cable to connect the two together. Remember to press F10 to toggle the display between the laptop display and the external display.
I don't know why you can't get into BIOS when you start the laptop by pressing the novo button. That's in the firmware before the OS even loads, unless the BIOS has become corrupted somehow.
Can only suggest that you try a power refresh and check if it enables you to get into BIOS for a start. If so then you may be able to repair the OS if its’ startup has become corrupted.
Turn off the laptop if on and disconnect the charger if connected
Here's the hardware maintenance manual for the laptop.
Go to p.35 to view the necessary pre-requisite steps and then the procedure to remove the battery. You don't have to remove it, only to disconnect it from the motherboard.
Once the battery is disconnected, press and hold the laptop's power button for 30 seconds and then release. This will restore the BIOS to its' default condition so hopefully it will start properly.
Reconnect the battery and reassemble the laptop. Connect the charger and turn the laptop on by pressing the Novo button and check if you can get into BIOS OK.
If you can get into BIOS now but after you restart the laptop it won’t boot into Windows, try the 3 start option as described in the safe mode link I posted i.e. force stop the laptop 3 times during boot, to check if you can now get into the Recovery area and repair the startup as suggested.