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HP Desktop 550-a114, will not turn on, though there is a green bright light on the motherboard

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  • Master
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If it won't power on at all its probably a failed power supply.

Posted on Apr 15, 2017

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  • HP Master
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Take a A+ cert course then tell this fib again.?

An LED can glow at 2vdc, tells you nothing!
only that some weak power is present, nothing more...!
learn that in electronics.
it can fail all theses ways.
good
bad.
weak
intermittent.

the PSU tests are covered here, take a volmeter
not some LED on a stick or parts glowing.
got 50 years of on the job doing this, from DC to daylight, from MIL to you name it.

http://pcdied.com/black-screen.html

Posted on Apr 15, 2017

Testimonial: "It can't be the power supply, when the green light on the motherboard is still on. It has to be something else. Do you know where I could get a FREE diagnostics done on my HP Pavilion Desktop?"

  • Anonymous May 31, 2017

    never say can't to any fully certified tech

    I can sell you 10 bad PSUs, all that are BAD
    and glow that LED
    cheap, cheaper than DIRT.
    http://pcdied.com/black-screen.html
    http://pcdied.com/power.html

    that last link shows real intel mobo. schematic
    so you can learn what is there.

    if the fans are dead. the PSU is bad
    if the PSU is ok then the MOBO, power logic
    is bad, or even the power switch wires fell off the MOBO. (saw 2 bad switches in 32 years on PC)
    in a real shop, we jumper the switch jack wires
    omg, it turns on, leaving what>? bad switch.
    if the Fans do run that means only 12vdc is good.. after all its just a 12v fan.
    not the other 9 power supply lines bad ?
    all must be good.
    all in the PSU and all regulators on the MOBO
    must work and guess what, they fail too.
    3million transistors there, or more, non trivial.

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Posted on Jan 02, 2017

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