Hey Kovan, have you tried a different SD card just to be sure it is not a defect SD card? Does the SD card click into placed in pushed in? Well, the SD card slot may have failed electronically if both the above checks up fine. You Mobicel Cherry tablet comes with 1 year service/replacement warranty - so if it is less than a year old and you still have the packaging and receipt, then you may want to consider taking it back to your retailer.