Based on your concern, I suggest trying the following steps:
1. Download the camera driver here
2. After downloading, install the camera driver then restart your computer.
3. Log back in then press the FN+ESC to enable the camera.
4. If you still cant open the camera try installing the lenovo power management to activate the function key.
--> you can download it here
5. After downloading, install the application then restart your computer. Try step 3 again.
If still experiencing the same concern, , I recommend to contact the technical support of Lenovo. They will set up a depot repair for you to diagnose the computer and to repair it completely. You may contact them at this number 1-877-4Lenovo (1-877-453-6686).
--> Hours of operation, 24 hours a day 7 days a week.
Hope it helps,
Thank you for using FixYa.