I am connected to arduino mega and the matrix is connected to 5V 3A power supply.

I also made sure everything is connected and made sure to change

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`#define CLK 8`

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` #define CLK 11`

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```
// testshapes demo for RGBmatrixPanel library.
// Demonstrates the drawing abilities of the RGBmatrixPanel library.
// For 32x64 RGB LED matrix.
// WILL NOT FIT on ARDUINO UNO -- requires a Mega, M0 or M4 board
#include <RGBmatrixPanel.h>
// Most of the signal pins are configurable, but the CLK pin has some
// special constraints. On 8-bit AVR boards it must be on PORTB...
// Pin 11 works on the Arduino Mega. On 32-bit SAMD boards it must be
// on the same PORT as the RGB data pins (D2-D7)...
// Pin 8 works on the Adafruit Metro M0 or Arduino Zero,
// Pin A4 works on the Adafruit Metro M4 (if using the Adafruit RGB
// Matrix Shield, cut trace between CLK pads and run a wire to A4).
//#define CLK 8 // USE THIS ON ADAFRUIT METRO M0, etc.
//#define CLK A4 // USE THIS ON METRO M4 (not M0)
#define CLK 11 // USE THIS ON ARDUINO MEGA
#define OE 9
#define LAT 10
#define A A0
#define B A1
#define C A2
#define D A3
RGBmatrixPanel matrix(A, B, C, D, CLK, LAT, OE, false, 64);
void setup() {
matrix.begin();
// draw a pixel in solid white
matrix.drawPixel(0, 0, matrix.Color333(7, 7, 7));
delay(500);
// fix the screen with green
matrix.fillRect(0, 0, matrix.width(), matrix.height(), matrix.Color333(0, 7, 0));
delay(500);
// draw a box in yellow
matrix.drawRect(0, 0, matrix.width(), matrix.height(), matrix.Color333(7, 7, 0));
delay(500);
// draw an 'X' in red
matrix.drawLine(0, 0, matrix.width()-1, matrix.height()-1, matrix.Color333(7, 0, 0));
matrix.drawLine(matrix.width()-1, 0, 0, matrix.height()-1, matrix.Color333(7, 0, 0));
delay(500);
// draw a blue circle
matrix.drawCircle(10, 10, 10, matrix.Color333(0, 0, 7));
delay(500);
// fill a violet circle
matrix.fillCircle(40, 21, 10, matrix.Color333(7, 0, 7));
delay(500);
// fill the screen with 'black'
matrix.fillScreen(matrix.Color333(0, 0, 0));
// draw some text!
matrix.setTextSize(1); // size 1 == 8 pixels high
matrix.setTextWrap(false); // Don't wrap at end of line - will do ourselves
matrix.setCursor(8, 0); // start at top left, with 8 pixel of spacing
uint8_t w = 0;
char *str = "AdafruitIndustries";
for (w=0; w<8; w++) {
matrix.setTextColor(Wheel(w));
matrix.print(str[w]);
}
matrix.setCursor(2, 8); // next line
for (w=8; w<18; w++) {
matrix.setTextColor(Wheel(w));
matrix.print(str[w]);
}
matrix.println();
//matrix.setTextColor(matrix.Color333(4,4,4));
//matrix.println("Industries");
matrix.setTextColor(matrix.Color333(7,7,7));
matrix.println("LED MATRIX!");
// print each letter with a rainbow color
matrix.setTextColor(matrix.Color333(7,0,0));
matrix.print('3');
matrix.setTextColor(matrix.Color333(7,4,0));
matrix.print('2');
matrix.setTextColor(matrix.Color333(7,7,0));
matrix.print('x');
matrix.setTextColor(matrix.Color333(4,7,0));
matrix.print('6');
matrix.setTextColor(matrix.Color333(0,7,0));
matrix.print('4');
matrix.setCursor(34, 24);
matrix.setTextColor(matrix.Color333(0,7,7));
matrix.print('*');
matrix.setTextColor(matrix.Color333(0,4,7));
matrix.print('R');
matrix.setTextColor(matrix.Color333(0,0,7));
matrix.print('G');
matrix.setTextColor(matrix.Color333(4,0,7));
matrix.print('B');
matrix.setTextColor(matrix.Color333(7,0,4));
matrix.print('*');
// whew!
}
void loop() {
// Do nothing -- image doesn't change
}
// Input a value 0 to 24 to get a color value.
// The colours are a transition r - g - b - back to r.
uint16_t Wheel(byte WheelPos) {
if(WheelPos < 8) {
return matrix.Color333(7 - WheelPos, WheelPos, 0);
} else if(WheelPos < 16) {
WheelPos -= 8;
return matrix.Color333(0, 7-WheelPos, WheelPos);
} else {
WheelPos -= 16;
return matrix.Color333(WheelPos, 0, 7 - WheelPos);
}
}
```