SD card shield and Mega 2560, tried everything, not working

I have a Seeedstudios v3.0 SD card shield and a Mega 2560.

I tried the FAT16 library and made modifications to change the pin to use 53, also tried the same thing with the SD card library. No luck either way, the error I get from using of the examples in the SD card library is Initializing SD card...Card failed, or not present

Has anyone successfully gotten it to work or have you used another shield that did work with the 2560?

I'm using a PNY 2GB SD card formatted with FAT16.