If your power has been out for 4 days, how are you posting on hbt?
your beer will be fine. People take kegs out of their keezers all of the time, let them warm up, and then later put them back in to drink from at a later date.
cold beer holds more co2 than warm, so the co2 should dissolve back into it when it gets cold again.
On a side note, sorry you've been out of power for so long, and hope it gets restored soon.