As always, check the outlet and swap out the power supply. Personally half of the power supplies I have in the house are usable for Obi's. Should be 12 vdc center pin is positive. If the 12 volt adapter plug fits in, then the current should be acceptable.
Because you were on vacation, I suspect a power surge OR that someone turned off an outlet. Some people have switched outlets (top may be switched while the bottom plug is hardwired). Was a neighbor coming over to water plants or feed animals?