I was using my notebook and it shutoff without my input (the nerve...). Now it will not power up. The battery is not removable, is fully charged (AC adapter light is solid white). When I press the power key the power and caps lock indicator lights flash once for less than a second but there is no sound from fan, no illumination on screen. I have tried several hard resets with the AC adapter unplugged followed by it being plugged in without any success. No external attachments, no hardware upgrades since it was purchased directly from HP. BIOS, display drivers and Windows 10 are all current. Hopefully someone way smarter than me can help me understand what the problem and solutions are. Thanks.