Thank you for your reply.

Is there a way to check what's broken, whether the controller, the motherboard, or what?

It leaves me perplexed that often are lost network connections.
Furthermore, does that LED yellow on the MB mean anything?

Is there a documentation for diagnostics?

You could try running 32 bit diagnostics https://www.dell.com/support/home/us/en/19/drivers/driversdetails?driverid=2mm6j

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@DELL-Josh Cr wrote:

You could try running 32 bit diagnostics https://www.dell.com/support/home/us/en/19/drivers/driversdetails?driverid=2mm6j

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But Windows doesn't start

Considering the vintage of an SC440, I would take a look at the can electrolytic capacitors on the motherboard. Check for any leaking of electrolyte and/or bulging, especially on the top.

Do a search online for "Capacitor Plague" for pictures of what to look for.

Randy

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@BotMan wrote:

Considering the vintage of an SC440, I would take a look at the can electrolytic capacitors on the motherboard. Check for any leaking of electrolyte and/or bulging, especially on the top.

Do a search online for "Capacitor Plague" for pictures of what to look for.

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I will take the card to a laboratory.

However, I ask where I can find the documentation of the server and the controller and how we can do the diagnostics without going through Windows.

Question: is it possible that the controller has been disabled by the BIOS?

"Is there a way to check what's broken, whether the controller, the motherboard, or what?"