@michiganbb So you thought that necro-posting and whining about a 3yo post would be useful? Give it a try and see if that fixes your issue. You would have to do this anyway. Even if something works for one, doesn't mean there's a guarantee it works for you,. Backup the PC and try the changes. If they don't work...move on to something else.

There was NO resolution here. Client was one of those who was difficult getting payment from so we terminated the relationship before we did anything else.

@Pete-S No external access so they are golden. Password has been changed to a 20 character one as well.

@NashBrydges Yep, changed it to yes and now I can access via SSH!!! Thank you for the help!

@Pete-S The modules have all been reseated and swapped around to other slots and still the same thing. The same 6 slots remain unidentified (or unoccupied according to iDrac).

The CPUs are E5-2650 v1.

I've already had the conversation with the owner. Looks like we're going to keep things as they are since everything is operating normally (with the obvious missing RAM). We have good tested backups with another server to migrate the workload to in under an hour should something fail. He's unwilling to spend the cash on a new server and a deep diagnosis will be pretty pricy to pay for my time so...status quo for now.

@NashBrydges Guess you can take a horse to water but you can't force him to drink.