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Optiplex 390 Amber power light, but all power looks good
I have an Optiplex 390 (actually 3 with similar behavior...).
PC would not power on. I did the power test and determine the Mobo was the issue.
I replaced the Mobo with a new one. Still can't power from front power button, but if I go at the back to the power supply 'power test button' and press on it the full PC comes on with all fans everything, but front power button is amber. And I get nothing on display, fans stay full speed. I can turn off, by pressing the from power button for a few seconds.
I tried using the CPU from another of the 3 PCs that had similar power issues and pointed to Mobo.
I reconnected all cables, tried different RAM modules, different video card, nothing makes a difference.
Not sure where to look now.
elpro999dell
367 Posts
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December 3rd, 2017 19:00
Assuming that you replaced the motherboard then it likely is the power supply has had it you'll need to buy a new one.
jorivesud
2 Posts
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December 4th, 2017 05:00
I have no OLD led pattern.
I did replace the Mobo, and the new one allows me to see all fans, HDD, and DVD spinning.
Are suggesting my new Mobo is dead also. The initial Mobo was detected bad by doing the BIST power test (which is in the video), I was not able to see anything working, it was a major Mobo failure. Can I still have a dead Mobo and have all attached devices working properly?
speedstep
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47K Posts
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December 4th, 2017 05:00
SOLID AMBER POWER BUTTON = DEAD MOTHERBOARD
BLINKING AMBER POWER BUTTON = BAD POWER SUPPLY.
Power LED state
Indicates system has power, but the POWER_GOOD signal is not yet active.
If the Hard Drive LED is off, it is probable that the power supply needs to be replaced.
If the Hard Drive LED is on, it is probable that an onboard regulator or VRM has failed. Look at the diagnostic LEDs for further information.
The BIOS will turn the LED to this state to indicate it has started fetching operation codes.
speedstep
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47K Posts
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December 4th, 2017 06:00
You have No LEDs and no beeps at all cuz your motherboard is DEAD. There are 4 LED's on the Front.
http://www.dell.com/support/article/us/en/04/SLN284978/a-reference-guide-to-the-dell-optiplex-diagnostic-indicators
Diagnostic LEDs for the OptiPlex series (2009 to 2012)
With this series, the diagnostic LEDs changed to include a combination of the Power button LED state and the diagnostic LED indicators. The Diagnostic LEDs remain 1, 2, 3, 4, and placed on the front of the unit. You could identify these system by their flat black and grey front face.
RoHe
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44.3K Posts
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December 4th, 2017 11:00
Have you considered failure of the front panel's circuit board and/or the mobo>front panel cable if both mobo give you the same issue? Or maybe even just a broken power button?