I have a RB411 that won’t boot (all leds stay on) using 24volt power adapter but it works If I use 9volt (just for testing). I had no problem before. What is wrong? Why I can’t use a 24volt adapter. Obviously is not working well with 9volt it hangs after a while.
First measure the output voltage of the 24vcc psu using a dmm just to be sure that the 24v psu is not faulty. Or try with another psu. Since the routerboard is working with another psu your problem is more psu related.