Thanks for the information logical_fallacy. I'm going add the ATX connector today, I'm glad its that simple or it may have been a costly mistake.
This is the Device Manager with the board connected:
Arduino:
I hope that's enough/the right information.
Thanks again for your help,
Leo.
I will definitely have to do that, thanks.Quote
if you are working on the board you might aswell look into the heated bed current problem, if you intend to use a heated bed with the board: Sanguinololu#Bugs overheating mosfet
Well I was able to successfully install FTDI driver and my PC recognises the board, I think. But the COM port does not show up. In the Arduino IDE as well as Pronterface I'm unable to select the COM port either. I'm not sure why.Quote
With just usb connected you should be able to communicate. Is the ftdi driver installed and did the com port show up on your PC? What errors did you get?
This is the Device Manager with the board connected:

Arduino:

I hope that's enough/the right information.
Thanks again for your help,
Leo.