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用U盘重装系统后不能正常开机的原因及应对措施

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　　如今重装系统对于很多用户来说，已经不是难事。不过，有不少用户用U盘重装系统后，出现电脑无法开机的情况。这种情况该怎么应对呢?下面小编讲讲导致U盘重装系统后无法开机的原因和解决方法。

　　1、主引导区的数据被破坏

　　当主引导区的内容被病毒破坏或者被其他程序篡改，就会导致死机无法开机。

　　解决办法：对于硬盘的主引导区的引导程序被破坏，我们可以使用Fdisk/MBR命令进行修复，或者使用KV3000的磁盘编辑功能查找0道0面的其他62个扇区是否有备份的主引导区程序，将其还原至0道0面0区即可。

　　2、主板方面发生故障

　　主要是主板上的硬盘控制器有问题，造成数据传输不稳定，错误率太高，才会导致无法开机的现象。

　　解决办法：可以查阅主板手册关于CMOS跳线的的信息并清除CMOS，不过这里要注意：在清除CMOS设置时必须拔掉主机电源线或者把主机电源的开关设置为off或0。

　　3、硬件更换或改变导致的

　　当主机的硬件配置有变化的时候，重装系统之后电脑启动会使用POST功能，但是系统无法识别新添加的硬件，还是会按照老的配置进行启动，所以就会发生无法正常开机的故障了。(也有可能是新添加的硬件兼容性不好)

　　解决办法：恢复硬件改变前的状态，检查系统是否能够正常启动。

　　4、BIOS设置错误

　　当BIOS设置错误时，硬盘模式设置有错误的时候，内存的读写参数设置有错误等都会造成不能正常启动开机的故障。

　　解决办法：可 以尝试着重新配置BIOS中的“PNP/PCI configuration”和“Reset Configuration Data”，选项设置分别为“YES”和“Enabled”。也可以使“Force Update ESCD”的BIOS选项设置为“Enabled”，这2种设置都可以尝试一下，然后存盘退出，再尝试看能否正常启动。

　　通过以上的讲解，我们可以了解到U盘重装系统后无法开机的原因大概有这么几个。这从反面也提醒我们，U盘装系统需谨慎。关于这方面的介绍，大家也可以在系统之家U盘教程栏目中查阅。

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