If you are taking the old PSU to an electronic shop nearby to see if it can be repaired (which doesnt make sense to try and repair it at this point if its truly failed, unless its something simple like replacing fuse), why not take the X2 itself and have them test it out? They will most likely have a PSU on hand that will work with it and finally eliminate the possibilities of what is the problem.
BTW, if the mobo and everything else works besides the psu, you could just get a cheap pc case and almost any pc psu and stick the X2 components in there. You will most likely get better cooling, quieter operation as a bonus in a much lighter case and be done.
or as
@atrfate would say, just get any decent pc and just run the TTX2 games on that instead