Hello. My name is***** can help you with your question.
The only reset for the system that does not erase the programming is to unplug it completely from power and then to plug it back in after a few minutes. Other resets require the system to be up and running first. There is a very good chance that the power surge has affected the equipment and damaged it. If you have a phone vendor that you normally work with I would suggest getting them into check the equipment.
When you do the restart, make sure it is unplugged completely and that if it is on a battery power backup, that it is disconnected from that as well.