电脑主机开着但是显示器显示无信号有几种原因:显示器问题、主机问题、内存条问题。
1、检查插座是否通电,检查连接线接口(vga或者dvi接口)是否接好(重要),显示器故障,换个显示器试下,判断是否是显示器故障了。
![](https://iknow-pic.cdn.bcebos.com/eac4b74543a98226760427698782b9014b90ebb3?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、数据连接线损坏,电脑主机显卡和显示器的连接线如果断裂或松动导致信号不能传输。
![](https://iknow-pic.cdn.bcebos.com/1b4c510fd9f9d72ac9afbc53d92a2834359bbbb1?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、金手指氧化,电脑主机长时间不清理很容易污染灰尘,内部的金手指也很容易氧化。
![](https://iknow-pic.cdn.bcebos.com/5ab5c9ea15ce36d3c7218c7e37f33a87e950b152?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
4、将显卡和内存卡拨出来用橡皮檫将金手指擦拭,用细软毛刷将灰尘清理。
![](https://iknow-pic.cdn.bcebos.com/377adab44aed2e73429389628a01a18b87d6fa02?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、风扇有没有正常工作,清理一下接口上的灰尘,换最新显卡驱动试试。整部机都清理一下灰尘,保持散热正常,并且杀杀毒。
![](https://iknow-pic.cdn.bcebos.com/37d3d539b6003af32f3bd32e382ac65c1138b6fe?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)