Originally Posted by nexus

you should be looking at +5v and +12v ratings only
.5a seems like you are talking about -5v or -12v that you should not be looking at for rail power
you need to look at the ratings for all and find a psu that does same or better
but the most important is the +5v and +12v then you make sure the -12/-5 are good enough then wire accordingly
then like said above about making the jumper switch as ATX dont have a TICK