Printr Board Ref D

[2up3dLouisiana]

I have a 2up3d printer. It was shipped with the Geetech PrintrBoard Ref D.
I'm using repetir Host, version 1.0.6 to Generate g-code.

My Z axis steeper motor, stopped working in the negative direction.
To test movement, i moved the Z-axis wire's, female connector, to the controller's, Y-axis male connector.
The Y axis female connector was relocated to the z-axis male connector on the board.
The z-axis worked, and I lost Y movement.

I ordered a PRINTR Board REF D. from amazon
I installed the new board and connected all wires, exactly the same, correct way, as the first board.

Repetir Host cannot not establish a connection, with my second board. I am receiving the following error message from RepetrHost

************** Exception Text **************
System.ArgumentException: The given port name does not start with COM/com or does not resolve to a valid serial port.
Parameter name: portName.

Next I re-installed the original (first) board. Repetir Host is able to connect to this board.
but his board has a lost axis.

Is firmware installation needed on the first board?
If yes, where can I download the firmeware, and installation instructions.

If firmware is not needed, what should I do, to get my printer operating properly.

Thank you, for all of you assistance.

[Mark]

"My Z axis steeper motor, stopped working in the negative direction.
To test movement, i moved the Z-axis wire's, female connector, to the controller's, Y-axis male connector.
The Y axis female connector was relocated to the z-axis male connector on the board.
The z-axis worked, and I lost Y movement.
"
You don't have to buy another board, I think the Z axis driver is dead, try to swap it with X or Y 's, see if it works.

[2up3dLouisiana]

I'm looking at my board.
I'm assuming the axis drivers are the black chips that are near the axis connectors?
Are the drivers soldered to the board or press fit?

[Mark]

Oh I see your driver is soldered on the board...then how about the wire of the Z axis? is it OK?