I have a Dell Latitude 5580 that will not power on.  After removing back cover, taking out battery and holding down power button for 30 seconds for hard reset, I am able to reconnect adapter, caps light indicator will come on and I am able to press the power button for one amber light and then the Laptop is unresponsive.  I can repeat these same step consistently.  When depressing the power button after reset I get no post, HD clicks or indication of any responsiveness.  Suggestions?