It won’t cause any damage, unless it doesI gave away my 1KW UPS long back when the power in our area was available 24/7 whole year round. Its only when there's a serious situation when the power goes down.
If I don't get a UPS and if the iMac gets powered off due to a power disruption, will the iMac's MoBo go corrupt ?
This used to happen to my assembled machines way back in 2008.