电脑开机,主板灯亮,风扇也转,就是启动不了,显示器上什么也不显示
推荐回答(5个)
电脑开机无显示,首先我们要检查的就是是BIOS。主板的BIOS中储存着重要的硬件数据,同时BIOS也是主板中比较脆弱的部分,极易受到破坏,一旦受损就会导致系统无法运行,出现此类故障一般是因为主板BIOS被CIH病毒破坏造成(当然也不排除 主板本身故障导致系统无法运行。)。一般BIOS被病毒破坏后硬盘里的数据将全部丢失,所以我们可以通过检测硬盘数据是否完好来判断BIOS是否被破坏,如果硬盘数据完好无损,那么还有三种原因会造成开机无显示的现象:
1. 因为主板扩展槽或扩展卡有问题,导致插上诸如声卡等扩展卡后主板没有响应而无显示。
2.免跳线主板在CMOS里设置的CPU频率不对,也可能会引发不显示故障,对此,只要清除CMOS即可予以解决。清除CMOS的跳线一般在主板的锂电池附近,其默认位置一般为1、2短路,只要将其改跳为2、3短路几秒种即可解决问题,对于以前的老主板如若用 户找不到该跳线,只要将电池取下,待开机显示进入CMOS设置后再关机,将电池上上去亦达到CMOS放电之目的。
3.主板无法识别内存、内存损坏或者内存不匹配也会导致开机无显示的故障。某些老的主板比较挑剔内存,一旦插上主板无法识别的内存,主板就无法启动,甚至某些主板不给你任何故障提示(鸣叫)。当然也有的时候为了扩充内存以提高系统性能,结果插上不同品牌、类型 的内存同样会导致此类故障的出现,因此在检修时,应多加注意。
对于主板BIOS被破坏的故障,我们可以插上ISA显卡看有无显示(如有提示,可按提示步骤操作即可。),倘若没有开机画面,你可以自己做一张自动更新BIOS的软盘,重新刷新BIOS,但有的主板BIOS被破坏后,软驱根本就不工作,此时,可尝试用 热插拔法加以解决(我曾经尝试过,只要BIOS相同,在同级别的主板中都可以成功烧录。)。但采用热插拔除需要相同的BIOS外还可能会导致主板部分元件损坏,所以可靠的方法是用写码器将BIOS更新文件写入BIOS里面(可找有此服务的电脑商解决比较安 全)。
主板和显卡是否匹配呢?主板上如果有自带显卡需屏避掉。如果将显卡插到板上了,不要再将显示器接到主板自带的显卡上
如果排除了其他硬件 没问题 你开机看能否进BIOS 进去后 看能否更改保存退出,如果没问题,那就很可能是CPU供电的问题,你可以用假负载查下CPU的各个电压是否正常,根据经验 问题百分之九十出在CPU供电上。如果你懂主板电路的话 。维修好的几率很高,可以自己试下。
BIOS自检不自检?开机的时候有没有滴的一声?
1、如果有滴的一声就证明BIOS自检正常,然后呢就是显示器或者各方面的接口没有插好。
2、如果开机没有滴的一声,就证明BIOS不自检,然后可能是主板的电池没电了,或者是CPU坏了。CPU坏了的情况下就启动不了。你去试试你的CPU或者电池换一块新的。各方面硬件再检查一遍,如果你肯定你检查过的没有问题的话。
如果再弄不好的话,只能证明“你”有问题了或者有一小方面你疏忽了,把主机拆了,从新装一遍吧。。。。。还不行找专业人士给你弄吧。
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