Problem using SD card reader on arduino MEGA 2560 sheild

Using Arduino Displays
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I recently bought an Arduino MEGA 2560, Arduino shield for TFT display with an SD card reader, and a 7 in display.

I am able to manually code the display, but I would like to use the SD card reader to upload images to the display. I have tried all the listed examples on BuyDisplay's website to upload images to the screen, but every time I run their code I get "initialization failed!"

Any ideas on how I can get the SD card reader to work?

Thanks.

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