Screen is flickering

[powersoft]

With a brand new GD3 I get the message 

---- GAMEDUINO 2/3 SELFTEST ----

Flash fault



This is my second GD3 with this message!!! 

What is this?

[jamesbowman]

If the screen is flickering it suggests a power issue. And if power is marginal it could trigger this fault.

Have you tried different power arrangements? Swapping USB cable and/or port can fix things.

[powersoft]

No, the screen is not flickering. As you can see in my post of the last day's the GD3 is working, but not the Self test.
I see also strange behaviour with the buttons. This morning I have run my program to catch my buttons with normal results.
After playing with the selftest this is not working any more.

[powersoft]

When I make a small change in the self test

static void load_flash(uint8_t *config)
{
byte b[128];

i2c_begin();
ram_write(config);
ram_get(b);
int diff = memcmp(config, b, 128);
if (diff != 0) {
Serial.println("Flash fault");
GD.Clear();
GD.cmd_text(GD.w / 2, GD.h / 2, 30, OPT_CENTERX, "Flash fault");
GD.swap();
//for (;; <===========

I get the error RAM:FAIL

[powersoft]

When I run the ram test as a stand alone test I get also a "0"


#include <EEPROM.h>
#include <SPI.h>
#include <GD2.h>

void setup() {
GD.begin(0);
Serial.begin(115200);
Serial.println(test_RAM());
}

void loop() {
// put your main code here, to run repeatedly:

}

static byte test_RAM(void)
{
uint32_t a;
for (a = 0; a < 0x40000U; a += 947)
GD.wr(a, a);
for (a = 0; a < 0x40000U; a += 947)
if (GD.rd(a) != (a & 0xff))
return 0;
return 1;
}