Thanks Haddy . I was lucky enough to bump into an ATX connector
skematic and was able to test that way, everything checked out as it should
.So I really don`t know what was going on but the PSU is fine again and re-mounted in the box.Slap me silly
for forgetting to post , that i found a solution and I thank you for your time to help . Infact I will be getting hold of one of those testers , seems like a lot less hassle than sticking probes in every which way to get readings.