Hello,
my power supply testers say the negative 5 is not working on the psu the psu maker said it isn't used and not needed is this for real? all 10 say no -5 tried 3 differant testers!!!
-5v is no longer part of the ATX spec and was optional for quite a few years, take a look at your psu label, does it claim to have a -5v rail ?
Look at the 20/24 pin connector, is there a pin missing ?