Network's IP Changed and lost internet connection

So the IP Addresses of the computers in my networks are
Suddenly we encountered power outage for a few seconds. After it my the computers ip addresses in the network is now different. And I cannot access the internet and network anymore.
Help please, I've tried restarting the modem,router and switch still nothing happens

You need to check layer by layer then....
From where you get the DHCP IP?
from where your NAT / PAT is done?

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