Test Firmware Failed

Hey everyone

I uploaded the test firmware to a Megatronics v2.0 board and while the motor for the x-axis turned, when I opened pronterface and tried connecting, it return the message "RCVD: 'fa'" which I take to mean as that it failed. Has anyone else faced this issue?

Additionally, when I uploaded Marlin and connected the board to pronterface, when I tried to home an axis, the LED labeled "LEX2" lit up and the board made a loud, prolonged beep sound and refused to move. Even though it failed the test-firmware I tried to see what would happen anyway, and clearly to no avail.

Try clear EPROM - find programm for this in standart Arduino library.
Then set 250000 speed in FW.

@Potapich which file in the Marlin code would I implement that to?

The test firmware only wiggles the steppers, strobes the LED lights, and outputs diagnostic messages to the USB serial port. It does NOT talk to Pronterface or any other printer control programs.

Also, the default of 250,000 baud is a non-standard speed that is not supported by some computers. Fall back to 115,200 baud and see if that fixes everything.....

I thought the firmware was supposed to return temperature values in pronterface? And I lowered the baudrate and I was wrong before, it wasn't the board making the noise, it was the motors whistling, which it is still doing.

Its in Arduino library - File - Examples - EEPROM - eeprom_clear.

Compile and load to board. After restart, load Marlin.

Now my new problem is that when I plug in the power when the board is connected to my computer, it automatically turns off my computer. All of the wires are connected as they should be/used to be, but I'm not sure how to pinpoint this short. Any suggestions?

Did you remove the "5V USB" jumper cap next to the USB connector? Just my guess, with a big disclaimer that I accidentally popped the on-board 5V power and have to feed my board from the USB 5V power so I would verify this against the schematics.....

Problem resolved guys, it just needed a different feedrate and steps per unit/ Thanks for all the replies!