Blackout while installing windows ?

Just clean install my computer yesterday and right in the Finishing Up step after Installing features and updates step done, there is blackout and my computer turn off right in the Finishing up step and back on after 2 minutes and windows continue the installation as usual without problem, until windows successfully installed on my computer. I've been using my computer for couple of hours and nothing problem, everything just fine. But i am worried about the blackout during the installation can cause damage which will happen later because maybe some file not yet installed because blackout.

All that is normal and it blanks the screen while it installs video driver same happens when you update video drivers

Its not normal blackout its because of power outage for about 2 minutes and my computer turn on again(not restart) and continue the installation process. I've been using my computer for couple of hours, i hope there's not problem occur later, but i think i am fine because the power outage happening while finishing up process its mean everything is done and ready to restart right ?

Just to make clear finishing up step/process i mean here is like in the picture

You didnt explain the power went out but it should be no problem I have had it and it just caries on with the intall

If you are concerned about it, just do another clean install. I would not be comfortable in your situation either. What I would do is use the current Windows installation to download a fresh Windows 10 to redo the USB flash drive:
https://www.microsoft.com/en-us/soft...load/windows10

Then use the fresh USB flash drive to do a new clean install:
Clean Install Windows 10

Better safe now than sorry later.