Hi @DuViMo, sorry to hear about this.
As there is no setting available in the phone enabling you to change the mapping of the hardware keys and the power key is crucial in order to do a software repair on the phone, I suggest that you get in contact with your local support team. They can assist you in having your phone sent to an authorized service center to be physically examined and repaired.
If you have any questions regarding the service, such as routines, warranty and consumer laws, these type of questions are best answered by your local support team as well, as they vary between markets.
I hope that helped!
