检查电灯、电源、线路的连接、插座和接触器、开关以及一切移动部件；
Check light bulbs, electrical power, cable connections, outlets and contacts, switches and any moving parts;
确保插紧电缆，对连接硬盘驱动器和计算机电源的电力电缆也要进行检查。
Make sure it is plugged in tightly and also check the power cable that connects the hard drives to the computer’s power supply.
找不到备份设备。请检查设备连接和电源情况。
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