Thanks Andy, I did have a look at V-carve last night and your right it does look good. Will have a look at Cam bam too once I'm up and running.
OK, the thing I cant understand is that it was all working fine last time I had it switch on and I don't think I've messed with the wiring since. The only thing I can think of is that I tried to (unsuccessfully) wire in the spindle control. But can't see how that would be connected.