单选:计算机开机后既无报警声也无图象,电源指示灯不亮,应先从()开始检查。

题目内容:
计算机开机后既无报警声也无图象,电源指示灯不亮,应先从()开始检查。
A.主板
B.电源
C.显示卡
D.内存
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