BobDMJ
1 Copper

BobDMJ. Optiplex 390 diagnostics

With a monitor, keyboard, mouse, and network cable connected, plugged in the power cable - nothing - pressed the diagnostic button on the power supply - diagnostic light solid green, all fans turn on and power button on front solid amber - but pressing it does nothing
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2 Replies
Mary G
5 Iridium

Re: BobDMJ. Optiplex 390 diagnostics

Nine year old computer sounds like it has given up the ghost. Mostly likely a motherboard failure. That means buying a new computer. Only thing worth trying is replacing the $2 cmos coin cell battery. See manual online at Dell Support for how to do it.

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speedstep
6 Thallium

Re: BobDMJ. Optiplex 390 diagnostics

The BIST button is not a system Diagnostic Button.

You can get a 390 with windows 10 pro for the same cost as the windows Disk alone.

https://www.walmart.com/ip/Dell-Optiplex-390-Refurbished-Desktop-Tower-Intel-Core-i3-3-3GHz-8GB-250G...

 

http://www.dell.com/support/contents/us/en/04/videos/videoplayer/JzNzFqNTpnGF1VTuKI-CBALVWirB074O

Bult In Self Test  BIST

Solid Amber power button is BAD POWER SUPPLY or DEAD MOTHERBOARD or both.

https://www.youtube.com/watch?v=udGOe7LQJEI

 


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Watch this introductory guide for troubleshooting and isolating power issues in newer Optiplex and Precision Workstation desktop systems. Many desktops are now configured with a Built-In Self-Test (BIST) for the power supply. The BIST can be used to isolate and troubleshoot power failures ...
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