Hi First:- Turn off the computer, press and hold the PWR button for 4 seconds.
Then - Leave only keyboard and mouse connected, disconnect all externally connected devices such as Docking Station, USB storage devices, displays, and printers. Unplug the AC adapter from the computer.
Next - Press and Hold the Power button for 15 seconds to Hard Reset. Rinse and Repeat; Re-Connect the AC adapter.
NOW begin checking/testing/proving the Hardware is fit for purpose. Power on your PC, press ESC (repeatedly), then F2 at the prompt. Choose System Tests (Fast Test does a 4 minute hardware check).