My R750 has been working great with 6 drives in a 12 slot chassis.

I installed 6 more SAS drives, but one slot is not recognizing the drive.

I have swapped drives.  This slot always a flash from both backplane and activity, but then just a green backplane light (heartbeat).

I am viewing via idrac and perccli.

I tried removing for 30 seconds, reboot, etc.

Not in dusty room, but I blow the connector with air anyhow.

Anyone have this issue and do you have a solution ?

Thank you.