故障现象：HP 商用机开机出现 6 短报警声音，并出现错误提示：912-the computer has been removed,the machine cover has been removed since last system start up.please ensure that any system access was authorized. 然后提示：Press F1 to continus 系统可以进入。
解决： 按 F10 键进入 BIOS 设置程序，选择 “hardware monitor setup”: reset case open status 把它的值设置为 enable 保存 bios 配置就可。
