CAN BUS Shield won't Initialize

Using Arduino Networking, Protocols, and Devices
1

Hi All,

I switched boards from a sparkfun red board (uno) to a Mega ADK board. What would cause my CAN BUS shield not to initialize from board to board? The code uploaded to the Mega is the same one I used for the uno.

My CAN libraries are:

<SPI.h>
<mcp_can.h>
<mcp2515.h>
<mcp2515_defs.h>

const int SPI_CS_PIN = 10;
MCP_CAN CAN(SPI_CS_PIN);

I'm using this to show initialized:

while (CAN_OK != CAN.begin(CAN_125KBPS))

{
  
Serial.println("CAN BUS shield init fail");
Serial.println("  Init CAN BUS Shield again");
delay(100);
}
Serial.println("CAN BUS Shield init ok!");
}