Internal sd card reader not working on mid 2010 mac mini after high sierra update

Problem:

internal sd card reader not working on mid 2010 mac mini after high sierra update!

I have 3 mid 2010 Mac mini’s used around my property as home automation machines running indigo software.

All three have been upgraded to 256 SSD‘s and 8 GB of ram.

All machines have 128 GB SD cards used to backup via time machine.

All has been fine until I started to upgrade these to latest OS.

On two of them after upgrading I can no longer see the SD cardS or the drives.

When running a system report the software states no internal Apple SDCard drive is present.

Anyone else had this happen to them?

The 3rd machine is still back at Sierra and all is fine.

I also have a 2014 MacMini which I have updated and all is well with a this machine.

Any my help would be appreciated.

Thanks,

Dennis