The error message Blackout occurred. Recover print? appears if the power goes off for a longer period of time during printing, and the hotend and heatbed cool down. Therefore, the printer will wait for you to safely resume the print.
There is not much troubleshooting to do, so here's a couple of things you should check before resuming or canceling the print.
If you have a question about something that isn't covered here, check out our additional resources.
And if that doesn't do the trick, you can send an inquiry to firstname.lastname@example.org or through the button below.