Hi Simon

I ordered my board direct from PMDX in the States, it arrived in less than a week.

Steve who owns the company is very prompt at replying to e-mails and very helpful, the boards are by no means the cheapest you can buy but the quality is second to none and the set up is very easy.

Before you go spending anymore of your hard earned cash I would try to get what you have working, I have never delt with Roy at DIYCNC but I have only read very good comments about him,I would drop him an email to see if he can help if we cannot sort it.

One more thing you could do, is with your meter check the voltage on your output pins on your breakout board, put one probe on the common terminal the other on the step pin, check the voltage without trying to turn on your spindle, then do an M3 command and check again and see if you get a difference in voltage. Depending on your system you should get a swing of between 0 to 5 volts (this could also be around 3.3 volts).