Problem with an old Dell desktop computer

Hey guys :) first post here! Happy to be part of the community!

My father has so some of these old Dell desktops at work that were purchased second-hand and some of them don't work at all. I was asked to provide assistance and we managed to get most of them and running outside.

Long story short - when you plug the power cable into the PC, the fan runs for a very short time and the power light flashes green light after that the computer is ready to go.

The problem with this particular computer is that when you plug the power on the computer the CPU fan starts to spin and power light blinks with a light orange and never stops. By pressing the power button has no effect. The power supply of the computer has been replaced, but the same problem persists (the power supply works normally on other computers). All the problematic capacitors have been replaced on the motherboard (which fixed this issue with other computers) but this has still not had any effect.

The computer has been tested with its minimum parts bare, stripped of all readers of storage, RAM and anything else, but is still unable to boot to the BIOS or do anything.

My question is - is this a known problem and what measures would be a good thing to determine the cause of the problem?

Unfortunately, I do not know the exact model of the computer, but I have some pictures of what you can find here:

Feel free to ask for additional information if required.

Thank you in advance!

CAP'

It is an Optiplex GX280 SFF.  Regulatory model DHP

http://www.Dell.com/support/home/us/en/19/product-support/product/OptiPlex-GX280/manuals

Shipping date: November 30, 2004, country: Denmark

The model is written around the ring on the power button.

The behavior is a Committee with bad traffic and bad diet.

Tags: Dell Desktop

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