Fault phenomenon:
After the HITACHI logo is displayed when the machine is turned on, the monitor and touch screen have no display, the control panel button lights flash in cycles, and can not enter the system.
Failure analysis：
When the machine is turned on, there is no display after the HITACHI logo appears, and the control panel button lights flash in cycles, indicating that the power supply of the machine is normal, and the fault is caused by a problem at the back end of the machine.
The back end of the machine consists of BE motherboard, CELL board and hard disk with system. It is on the right side of the machine and can be seen after opening the casing. First, check whether the system is faulty. After replacing the hard disk, the same fault still exists when the machine is turned on, so it is suspect the BE motherboard.
Repair results：
After replacing the BE mainboard, the machine started up and worked normally
