My power supply tester says -5 volt is bad

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!!!
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More about power supply tester volt
  1. -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 ?
  2. January, 2002 is when the -5V specification was removed from the ATX12V Power Supply Design Guide.

    The -5V rail was used for old-school floppy disk drive controllers and some ISA bus cards.
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