Power supply tester sometimes shows -5V is not on, but PC seems to work - normal?

Posted on 2006-05-31
Last Modified: 2010-04-25

I often use a power supply tester to diagnose PCs that don't work right, and especially on Dell computers I often see the -5V LED not light up, even when the PC runs without problems.

What does the -5V do, and is there any possible issue with this, or is it just a silly Dell thing?

Question by:semmelbroesel
    LVL 69

    Accepted Solution

    The negative voltages (-5v and -12v) are for legacy purposes and are not used in today's motherboards.  You don't need to worry about them.

    Author Comment

    Thanks, that's exactly what I needed to know :-)

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