This is a guess, coming from a similar situation where I could get nothing on my monitor after a power surge, and the way tech support had me handle it successfully (can't hurt to try it).
Unplug the monitor from the wall and the computer. Push in the monitor ON button and hold it in for a full sixty seconds. Then hook it back up and hopefully it will work again as mine did. I was told that the monitor needed to be de-electrified following the surge. Good luck.