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RAM DIMMs disabled on Dell PowerEdge R610

A customer has started having a recent issue with his Dell PowerEdge R610 server.

While the server is running the POST is displays the messages shown in the screenshot about several DIMMs being disabled.

This server used to have 24 GB of RAM and now only 8 GB of RAM is recognized within the Server 2012 R2 OS.

I have gone into the BIOS and haven't yet been able to find a way of setting the BIOS back to its default settings.

I have also looked at the RAM and other configurations within the BIOS and haven't yet been able to find any settings or configurations that look like they could change these settings.

This server is already running the latest BIOS version and when the Dell update is run all other updates have also been installed.

This issue started occurring around 2 weeks ago and since then the customer has tried to fix this issue by updating the BIOS to the most current version which hasn't fixed this issue.

This server is out of warranty otherwise I would call Dell.

What can be done to fix this issue so that the full 24GB of RAM will once again be recognized by this server?

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I checked and the BIOS memory configuration is already set to "Optimized mode" and yet this is still happening.

What else can be done to fix this issue?
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No hardware changes were made two weeks ago in fact the case on the server has never been opened.

I will proceed with the removing the DIMMs to see if I can isolate which one(s) might be bad.
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Resolved the issue by pulling out and putting each RAM DIMM back into the system board slot.
Hello Knowledgeable,

So, reseating the DIMMs did the trick?
There was not bad DIMMs?   Sweet.

Thank you...

Rojosho