I have encountered a troublesome problem. Please help me to analyze it. I use Matt’s PCB, but I only have one motor that can be powered on. I have replaced several kind of stepping drivers, 4988,2208,2225,but the situation is the same, and only when two specific driving boards are combined, one of them will work, and after changing the position of the driving board, the fixed driving board is still easy to use. This should eliminate the problem of PCB, and the stepping motors will also work. The driver has been replaced so much times that it can’t be broken. I can’t find out the reason. Please help me. Thank you!