Now why would be hard on you with or without your amputated leg ?
Anyway, congratulations, you are the very first member to ask a question about a 3D printer on this forum. You win a virtual Guinness!
Your printer is a Chinese low-budget 3D printer a copy cat of Makerbot, it a good machine but it needs a lot of upgrades to function properly. Have you done such upgrades?
You must realize that it's difficult to provide support for clones as often they are exactly the same as the original machine.
However, when card reader is malfunctioning, the bug could be with the card or the card reader brass points got dirty or corroded and should be gently cleaned.
Good luck and God save the Queen.