i have IU 22 A Cart , it going to boot but within 3 second it shutdown i try to isolate the front and back to make the booting depen on the back side but it always failed so now the problem may be from the back boards or the Power Supply , so if it is from the power supply how can i diagnose and if it is not from the power supply how can i diagnose if it is from the HOST or from the SIP ,
thanks