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| On Aug 13, 2:28 am, ehsjr <eh...@bellatlantic.net> wrote:
> 3.5 year old Dell. Won't power on, supply fan doesn't spin.
> Pulled supply & it powers up outside the PC. (10 ohms between
> any red & black wire; green wire shorted to black for testing
> outside the PC). Pulled everything from the mobo (motherboard)
> one thing at a time, still won't power up. Tested PC power on
> switch with ohmmeter - tests good. No shorts at power connector
> pins (ohmmeter), no visible burns, no swelled lytics. Was working
> a week ago.
Reconnect switch, power supply, and motherboard. Best test is all
components of the power supply system united, undisturbed, and loaded
by the computer. Follow the two minute procedure posted in "When
your computer dies without warning....." starting 6 Feb 2007 in the
newsgroup alt.windows-xp at:
http://tinyurl.com/yvf9vh
Best and informative test means power supply remains connected rest
of power supply 'system' and to a full load - the computer. According
to that procedure, first measurement with a 3.5 digit multimeter would
be a purple wire from power supply to motherboard - both before and
when power supply switch is pressed. Other important numbers are
voltage on green and gray wires. And finally what happens to voltages
on orange, red, and yellow wires when power switch is first pressed.
Lower limit numbers are 3.23, 4.87, and 11.7. But based upon what was
reported, the problem probably will be apparent long before getting to
that orange, red, and yellow measurement.
Best testing does not remove anything. Reporting those numbers here
may provide more useful facts that are otherwise not apparent. Chance
are the problem will be apparent with the purple, green, and gray
wires before and when power switch is pressed.
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