Question
Power outage for 2 hrs would not restart controller.Screen is all blank.New battery still blank screen. power is on and going into transformer Checked transformerwith new 24 v transformer is ok.Nothing looks burnt at circuit board.PS. All was ok prior to power outage. Help

Answer
With the crazy weather in the US lately, I'm guessing I'll get a number of these questions.
Did you have a storm which caused the power outage? Is so, you probably have power surge or lightning damage to the controller. It will need to be replaced.
You can use the transformer to check the valves.
Hook one transformer wire to the common "COM" of the terminals. Then touch the other transformer wire to the zone number terminals. The valve should come on. This will at least determine the valves are OK.
Hope this helps, even though it's probably bad news.

MATT