Mac Mini shows one ram card slot empty?

Hi
I have a mac mini 2.3 i5 purchased in 2012. It came with 2gb of ram. I exchanged the 2 1gb cards for 2 4gb cards as per instructions.
It seemed to be a bit slower than I expected all along. I recently checked the system info and it shows only 4gb total ram. 4gb in 1 socket and the second sockets shows EMPTY.
I reversed the cards and it made no difference. I put the old cards back in and it still showed one slot EMPTY?
Is there any option that I should be choosing to turn the other socket on? Does this indicate a problem with the unit?
Thanks Much!

Try pushing the bottom module firmly into it's slot
and swing it down into the clips,
then do the same with a module in the top slot.
Now if none of the modules are working in one of the slots > Contact Apple Support

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