Have a quick glance at the bottom part of your computer.
Emergency-reset
hole
Emergency-reset hole can help you to recover computer
when the
computer stops responding and you cannot turn it off by pressing the
power button. Do the following to reset your computer:
Disconnect your computer from ac power.
Insert a straightened paper clip into the hole to cut off power supply temporarily.
Connect your computer to ac power and then turn on your computer.
Note:
If your computer is still no response, you can call Lenovo Customer Support Center to get further help.
CAUTION:
When the computer is operating, it should be
placed on a hard and flat surface with its bottom area not in contact
with user’s bare skin. Under normal operating conditions, the temperature
of the bottom surface will remain within an acceptable range as defined
in IEC 62368-1, but such temperatures can still be high
enough to cause discomfort or harm to the user if directly touched
for over one minute at a time. As such, it is recommended that users
avoid prolonged direct contact with the bottom of the computer.