I just visit this forum to write my thoughts about that SD slot
Is it brand new ?

Two things are sure, the Bootloader recognize there is an SD card, it show now GO 710
Next your device want to read from the SD card, but ............... no success.
Watch carefully the flatcable, be sure the connector is closed
Try to look inside if there is any damage of any contact

When I've a quick look at my spare one I'm able to see all the contacts
On the flatcable is written

Valencia -Flex2-V2
PCB P/N DD0VF5TH311
FPC CABLE ASSY VF5
(YAM) SD-CARD
(50P.R3A)

Why don't you live next door ?