Probably the best move after you've checked to see if the fans on the supplies are good and if swapping the supply makes a difference. Blown power supplies are usually caused by FET/IGBT issues and wind up blowing the small fuse on the AC end of the supply. If new ones are .02 btc I'd say go that way first.

Antminer boards tend not to short out the whole supply line, what usually happens is a chip goes bad but since it's one chip in 64/80 it just raises the voltage slightly on the rest of the chips and shuts down the board because the clock and spi signals don't flow through. You can quickly check by disconnecting the boards from the supply and see if it works. If it does check each board's power connections with a meter looking for 0 ohm resistance.