I suggest you to follow the steps provided below, first to release any static power in the laptop that may be causing this issue: 1. Remove the battery and the AC Adapter from the laptop.2. Press and hold the Power button for 20 seconds and release it.3. Reconnect the battery, AC Adapter and press the Power button.4. The laptop should power on if the static charge was the cause. You can press the "Fn" key and the "Power" button to start the hardware diagnostics if the laptop fails to power on after following the steps provided above.
The computer is only 16 months old but the last month has been in this state: I had a previous problem that required that I replace the Motherboard, and now I'm stuck in a loop: Turn it on as normal, enter the BitLocker thing (understandable, new motherboard, old SSD) diagnostics are perfect It wants to update so it does, but when it restarts it never turns on, and the only thing that activates is the orange LED power light when I and pressing the power button.  I give it a rest and do a hard reset, and it turns on as normal.   I used to think this was a problem with the BIOS updating, but the update that last killed it was something for windows (I think)   Thanks!
G3 1500 will NOT TURN ON after update and restart