|If the PSU has a 115/230 voltage switch make sure it's in the correct position. Don't guess and if it needs to be changed make sure the A/C power cord is removed.|
Yeah it sounds like a short or at least something is sucking too much amperage when you turn it on. With the power cord removed temporarily disconnect all the drives, USB drives and add-on cards that aren't needed for boot up. Then reconnect the power cord and see if it boots.
As already asked, post back info on the power supplies.