good morning companions I have a problem with an AIWA sound system model cx-zr990lh ah when connected to the power turns on the lights and emits a hum in the speakers and does not allow me to turn it on or another function and the screen turns on and off and in other occasions when it turns on normal and it also works normal but it is very rare that it turns on normal, I hope you can help me with the diagnosis and how to repair it, before hand thanks for your help.