VM8095 not reading SD card

My Vm8095 is not reading the SD card. When we turn in on with no SD card in it, it says ‘no SD card’. When we turn it on with the SD card in it, the screen stays blank. I need this problem solved with high urgency.
Thanks in advance!

By the way, I’ve named the folders on the SD card A-B-C-D-E-F and the tunes are in these folders…should be correct wright?

Have you tried with other SD cards?
There is no need to be the folders A, B, C… etc. on the card to test.