the first thing(s) you should do is double-check your power/remote/ground wires and fuses...
1. fuses: the M2-ATX has an on-board fuse and you should have a fuse at the source of your power and remote wires as well.
2. power/remote: use a multimeter to verify that there is ~12v on the power and remote PSU terminals.
3. ground: make sure you have a good, clean ground. factory bolts are often bad ground points due to panel paint and bolt coatings. make sure the ground ring contacts a clean, unpainted, uncoated metal chassis/floor panel.