Hi there and welcome
Can you tell me please exactly what you have tried Alexandra, so we do not repeat this please?
Ok, the actual procedure is to remove the power cable from the unit and then hold the power button in for 60 seconds. It completes the circuit, draining residue power.
Then connect the power cable and try to turn it on.
Let me know the results please.
remove the power cable and try to start it just on battery, does it the start?
ok, hold the power button in and with it held in, then connect the cable, disconnect and repeat 5 times, keeping it connected for 5 seconds each time.
It is the internal mainboard that has faulted. Its processing no power at all and will be the voltage regulator that transfers the power from battery to board.
I am really sorry about this and you are going to have to return the unit to have this replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service, that would be greatly appreciated.