您是否(Are)在启动或使用计算机时出现黑屏或空白显示？有时您的显示器可以很好地连接到您的计算机，但最终会出现黑屏并显示诸如No Input或Cable Not Connected之类的消息。
计算机显示屏(computer display)可能会出现空白或黑色的原因有很多，我将尝试通过以下所有不同的选项。通常，此问题与某些硬件有关，无论是视频卡(video card)、电缆、显示器、RAM 还是主板(RAM or motherboard)。
有时，它也可能是与软件相关的问题。我将首先提到更简单的修复，因为最坏的情况(case scenario)是必须在您的计算机上更换一块硬件。
方法 1 – 检查电源
你可能已经这样做了，但它仍然值得一提，因为它发生的频率比你想象的要多。检查以确保显示器已打开，这通常由电源按钮(power button)本身的某种指示灯指示。如果指示灯亮起，则显示器已打开，您应该会看到一些消息。
如果显示器已打开，但没有显示任何内容，请尝试按菜单按钮(menu button)以调出内置显示器控件。如果您仍然有一个空白屏幕，那么这可能意味着您的显示器有问题。即使没有任何连接，您也应该能够调出监视器菜单(monitor menu)。如果您有一台显示器，请尝试连接另一台显示器。
如果单独的显示器工作正常，则可能意味着原始显示器的电源(power supply)不良。尝试更换电源(power supply)，看看是否能解决问题。
现在检查以确保计算机已正确打开。此处的主要内容是在打开计算机电源时检查是否有任何警告灯或异常蜂鸣声。如果电源按钮(power button)或其中一个状态指示灯为红色或橙色，或者计算机在开机时发出多次哔哔声，则表明存在内部问题。
您可以阅读我之前关于如何测试您的计算机是否存在内存问题的帖子，这可能是导致哔哔声的一个原因。哔声也可能与主板、视频卡等有关。您必须参考PC 制造商(PC manufacturer)手册才能弄清楚哔声或状态灯(beeps or status lights)的含义。
如果电源已打开并且一切正常，但您的显示屏上仍然没有显示任何内容，则计算机可能已进入待机或睡眠模式并且没有被唤醒。尝试按键盘上的键或移动鼠标。如果这些都不起作用，请尝试按电源按钮(power button)重新启动计算机。
方法 2 – 检查电缆
下一个最简单的事情是检查所有电缆。无论您是使用VGA、DVI、HDMI 还是 DisplayPort(HDMI or DisplayPort)将计算机连接到显示器，电缆有时都会脱落。对于未拧入显示器背面的电缆尤其如此。
确保(Make sure)检查 PC 和显示器上的连接。对于那些拥有多个视频卡(video card)的人，您需要小心连接显示器的方式。
如果您有专用显卡，请确保显示器连接到显卡而不是主板视频连接(motherboard video connection)。默认情况下，Windows应该在您拥有单独的显卡时自动禁用主板显卡，但有时这不会发生。
如果您最终将显示器连接到主板，它可能会工作一点，但突然变成空白。重新启动可能会解决问题，但它会再次发生。如果您有双显示器，并且将一台连接到主板，另一台连接到显卡，那么一台显示器最终会出现空白，现在您知道原因了。
如果电缆已连接并且您只有一个视频连接(video connection)，那么您需要排除不良电缆。为此，您需要找到另一台显示器来连接您的计算机。如果第二台显示器的屏幕也是空白的，则可能是视频电缆(video cable)的问题。
如果您有多个连接选项（例如DVI、HDMI等），请尝试更换视频线(video cable)或使用不同的视频线(video cable)。如果使用VGA有效，则可能意味着您的HDMI 或 DVI 线(HDMI or DVI cable)存在问题。
方法 3 (Method 3) – 检查分辨率(– Check Resolution)、显示和来源(Display & Source)
有时，如果您不小心将Windows中的分辨率设置为高于显示器支持的分辨率，它就会变成空白。要解决此问题，您必须先以安全模式启动Windows。
将计算机置于安全模式后，请按照我在此处的说明解决由于屏幕分辨率导致的黑屏问题。
在大多数现代版本的Windows中，系统实际上会在 15 秒内恢复到原始屏幕分辨率(screen resolution)，除非您单击“保持更改(Keep Changes)”按钮。此外，Windows通常会检测您的显示器可以支持的最高分辨率并仅显示这些选项。
因此，如果您使用的是旧版本的Windows(Windows)或非常旧的显示器，您只会遇到此程序。另一种最终出现空白屏幕的情况是，当您将笔记本电脑连接到辅助显示器或投影仪(display or projector)时，您只需在不告诉Windows的情况下将其拔下。
您通常可以通过按功能键之一，然后按键盘上的监视器键(monitor key)在笔记本电脑上解决此问题。
最后，您还应该确保显示器上的输入源(input source)设置为正确的输入。大多数显示器通常会自动检测输入源(input source)，但有时会禁用此功能。按下显示器上的按钮以调出选项并转到输入(Input)并切换到正确的输入。
方法 4 (Method 4) – BIOS 和恢复选项(– BIOS and Recovery Options)
如果您在打开计算机时可以看到初始启动屏幕，但是一旦(boot screen)Windows开始加载它就会变成空白，那么您就知道这是Windows的问题。
如果Windows已损坏，那么您唯一的选择是启动到安全模式，然后尝试使用System Restore/Automatic Repair或使用重置或刷新我的电脑(Reset or Refresh My PC)功能来修复Windows 。
我会先尝试系统还原(system restore)或自动修复，如果这些都不起作用，然后尝试重置您的 PC。重置您的 PC 将保留您的所有程序和数据，但重新安装Windows 系统(Windows system)文件。
方法 5 – 检查硬件
最后一步是查看实际的硬件。在执行任何其他操作之前，您应该尝试断开所有设备和外围设备与计算机的连接，例如键盘、鼠标、外置硬盘、扬声器、打印机、扫描仪等。
有时，另一件硬件的问题可能会导致显示屏变黑。如果这不起作用(t work)，那么您需要检查计算机和显示器上的实际端口连接器是否损坏。
有时有人没有正确取出电缆，最终会弯曲计算机上的视频端口(video port)。有时，人们试图将电缆插入不匹配的连接中，最终可能会损坏您在端口内看到的金或银连接器。(gold or silver connectors)
除了将计算机带到维修店(repair shop)以修复弯曲或损坏的端口之外，您确实没有很多选择。大多数时候，他们会告诉您只需更换显卡。
如果您对技术有点了解，您可以尝试打开您的计算机并检查(computer and check)以确保所有东西都已正确连接或就位。您应该已经使用我上面提到的文章检查了RAM，但您还应该确保视频卡(video card)上的风扇正在运行。
此时唯一的其他问题是您的主板或硬盘驱动器。您可能需要维修您的计算机，因为尝试自己弄乱这些组件可能会造成更大的损坏。如果您有任何问题，请随时发表评论。享受！
Fix Blank or Black Monitor Problem on a PC
Are you getting a black screen or blank display during boot up or when using your computer? Therе are times when уour monitor is connеcted to your computer just fine, but you end up getting thе black screen with a message like No Input or Cable Not Connected.
There are many reasons why a computer display may go blank or black and I’ll try to go through all the different options below. Most often than not, this issue is related to some piece of hardware, whether it’s the video card, cables, monitor, RAM or motherboard.
Occasionally, it can be a software-related issue also. I’ll mention the easier fixes first because the worst case scenario is having to get a piece of hardware replaced on your computer.
Method 1 – Check Power
You’ve probably already done this, but it’s still always worth mentioning because it happens more often than you would think. Check to make sure the monitor is turned on, which is usually indicated by some kind of light on the power button itself. If the light is on, the monitor is on and you should see some message.
If the monitor is on, but nothing is showing up, try to press the menu button to bring up the built-in monitor controls. If still you have a blank screen, then this could mean there is a problem with your monitor. Even with nothing connected, you should be able to bring up the monitor menu. Try connecting a different monitor if you have one.
If a separate monitor works fine, then it could mean the power supply is bad on the original monitor. Try replacing the power supply and see if that fixes the issue.
Now check to make sure the computer is properly turned on. The main thing here is to check for any warning lights or unusual beeps when you power on your computer. If the power button or one of the status lights is red or orange or if the computer beeps several times when turning on, this is indicative of an internal problem.
You can read my previous post on how to test your computer for bad memory, which can be one cause for the beeps. The beeps can also be related to the motherboard, video card, etc. You will have to reference the PC manufacturer manual to figure out what the beeps or status lights mean.
If the power is on and everything looks fine, but you’re still not getting anything on your display, the computer may have gone into standby or sleep mode and isn’t being woken up. Try pressing keys on the keyboard or moving the mouse. If none of that works, try restarting the computer by pressing the power button.
Method 2 – Check Cables
The next easiest thing to do is to check all the cables. Whether you are using VGA, DVI, HDMI or DisplayPort to connect your computer to your monitor, cables can sometimes become detached. This is especially true for cables that don’t screw into the back of a monitor.
Make sure you check the connection at the PC and on the monitor. For those of you who have more than one video card, you need to be careful how you connect the monitors.
If you have a dedicated graphics card, then make sure the monitor is connected to the graphics card and not to the motherboard video connection. By default, Windows is supposed to disable the motherboard graphics automatically when you have a separate graphics card, but sometimes this doesn’t happen.
If you end up connecting your monitor the motherboard, it might work for a little bit, but suddenly go blank. Restarting may fix the problem, but it’ll happen again. If you have dual monitors and you connect one to the motherboard and one to the graphics card, then one monitor will end up blank and now you know the reason why.
If the cables are connected and you only have one video connection, then you need to rule out bad cables. To do this, you need to find another monitor to connect your computer to. If the screen is blank on the second monitor also, then it could be an issue with the video cable.
Try replacing the video cable or using a different video cable if you have multiple connections options like DVI, HDMI, etc. If using VGA works, then it could mean there is an issue with your HDMI or DVI cable.
Method 3 – Check Resolution, Display & Source
Sometimes if you accidentally set the resolution in Windows higher than what the monitor supports, it will simply go blank. To fix this, you’ll have to start Windows in safe mode first.
Once you have gotten the computer into safe mode, follow my instructions here on fixing the blank screen issue because of screen resolution.
In most modern versions of Windows, the system actually reverts back to the original screen resolution within 15 seconds unless you click on the Keep Changes button. Also, Windows normally detects the highest resolution your monitor can support and shows only those options.
So you’ll only run into this program if you are using an older version of Windows or a really old monitor. Another situation where you can end up with a blank screen is when you have connected your laptop to a secondary display or projector and then you simply unplug it without telling Windows.
You can normally fix this on laptops by pressing one of the function keys and then pressing the monitor key on the keyboard.
Lastly, you should also make sure that the input source on your monitor is set to the correct input. Most monitors normally auto-detect the input source, but sometimes this feature can become disabled. Press the buttons on your monitor to bring up the options and go to Input and switch to the correct input.
Method 4 – BIOS and Recovery Options
If you can see the initial boot screen when you turn on your computer, but it goes blank once Windows starts to load, then you know it’s an issue with Windows.
In Windows is corrupt, then your only option is to boot into safe mode and then try to repair Windows either using System Restore/Automatic Repair or using the Reset or Refresh My PC feature.
I would try system restore or automatic repair first and if neither of those work, then try resetting your PC. Resetting your PC will preserve all your programs and data, but reinstall the Windows system files.
Method 5 – Check Hardware
The last step is to take a look at the actual hardware. Before you do anything else, you should try disconnecting all devices and peripherals from the computer like the keyboard, mouse, external hard drive, speakers, printers, scanners, etc.
Sometimes a problem with another piece of hardware can cause the display to go blank. If that doesn’t work, then you need to check the actual port connectors on the computer and on the monitor for damage.
There are times when someone doesn’t properly take out a cable and it ends up bending the video port on the computer. Sometimes, people try to stick a cable into a connection that doesn’t match and that can end up damaging the gold or silver connectors that you see inside the port.
You really don’t have a lot of options other than taking your computer to a repair shop in order to fix the bent or damaged ports. Most of the time, they will tell you to simply replace your graphics card.
If you are a bit technically savvy, you can try to open up your computer and check to make sure everything is connected or seated properly. You should have already checked the RAM using the article I mentioned above, but you should also make sure the fan on the video card is running.
The only other issue at this point is your motherboard or hard drive. You’ll probably need to get your computer serviced since trying to mess around with these components yourself can cause more damage. If you have any questions, feel free to comment. Enjoy!
