If you want to test it without hooking a servo up - or a brushed servo up you need to set the dip switches correctly for brushed. If it doesn't see the hal sensors it isn't going to give you a green light (or the hal sensors are not hooked up correctly).
amc's site seems to be down for me - but this
http://www.a-m-c.com/download/support/an-007.pdf
explains how to run a brushless drive with a brushed motor. IIRC you need to switch the phasing swith to off (60deg instead of 120deg)