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Power supply test results

by Bulletrushout / February 21, 2010 9:50 AM PST

I have two dell Dimension 4700 pc and both seem to have suffered the same faith ie: refusing to power up. I use my my ULTRA 20/24 MOTHERBOARD tester to test each power supply and the reading is the same. The -5v light is the only light on the tester not lit up. Can anyone say what this means?
+5v, -5v +12v +5vSB PG -12V +3.3V
Each of these numbers have a green light above them and the -5v never lit up, could this means that my power supply is bad. Also only the power supply fan comes on. The cpu fan does not.
Dell dimension 4700, xp-pro,80ghd and 1gbMemory

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Just Suggestions..
by Grif Thomas Forum moderator / February 24, 2010 1:07 AM PST

If the computers are plugged into a UPS/Surge Protector, remove that as a potential problem and plug directly into the wall outlet.

If that doesn't fix the issue, then buy or swap in a known good power supply on one of the computers.

Hope this helps.


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Thank you
by Bulletrushout / February 24, 2010 6:39 AM PST
In reply to: Just Suggestions..

I will follow your advice and see if it helps.

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Forget the -5 volts
by peacox / February 24, 2010 12:04 PM PST

it was made optional in the specification for ATX power supplies in 2002 and removed from the spec all together in 2004. Very few ATX power supplies include -5 volts now. It's only used for very old AT systems.

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