SDHC cards not working anymore on Lenovo U310

Hello,
The integrated SD card reader of my Lenovo U310 used to work fine until a couple of months ago.
However, now it does not read SDHC cards (it used to read them)! It reads fine standard SD cards, and also micro SDHC cards (using their adapter of course).
My girlfriend owns my same laptop and she has no problem at all! Her laptop has always read fine SDHC cards.
The device manager recognizes the SDHC card and if I go to “my pc” I cannot see it there unless I tick the “Hidden Items”.
I tried to uninstall and reinstall the drivers
Download and install the official “Alcor CardReader Driver” from the official Lenovo U310 support page
Comparing the drivers the computer uses with the drivers on my girlfriend computer and they are identical!!
Change the drive letter from disk management
Format and re-installed Windows 8.1 64bits
Nothing helped!
Please note that if I uninstall the drivers and re-insert the SDHC card, the computer plays the sound and install the drivers, but the card remains not accessible.
Pictures here:
1.
2.
3.
4.
Is anybody able to help me?
Thank you,
Andrea

Hello,
Thanks for your reply.
I have tried 2 different SDHC cards:
1. San Disk 16GB Class 10 (30MB/s)
2. Toshiba 16GB Class 10
They both work on any other computer and cameras.
I also tested them on my girlfriend's computer (she owns exaclty the same laptop that I have, Lenovo U310).
Thus, the SDHC cards ar not faulty.
"make sure the port isn't blocked in the Y50". What do you mena exactly?
The reader works fine with standard SD cards, or with micro SDHC cards (using the adapter adapter).
I tried to use some partition manager but did not work. "Please insert a disk in D: .... "
Thanks for helping

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