插上电源，打开电源——这听起来很容易让您的 PC 运行，但并不总是那么容易。如果您的显示器上没有任何东西可以让您实际使用它，那么您的 PC 风扇是否在旋转并不重要。显示器上的无信号错误可能会让您摸不着头脑而没有答案。
值得庆幸的是，这类问题通常很容易解决。如果某些更常见的修复程序不起作用，则表明您可能需要调查以进行维修或更换的硬件故障。为了帮助您处理显示问题，当您的 PC 显示器没有信号时，您可以尝试以下一些故障排除提示。
检查您的布线和电源(Check Your Cabling and Power)
在您急于撕掉显卡或前往亚马逊(Amazon)购买新显示器之前，您应该仔细查看您的 PC 和显示器，以确保您没有电缆或电源问题。
这是一个简单的检查来完成。首先(Start)跟踪显示器和 PC 之间的电缆，以确保没有松动的连接。例如，一根松动的HDMI 电缆(HDMI cable)可能会阻止您 PC 的输出显示（反之亦然）。
您可能还会发现显示电缆本身有问题。如果您看到电缆损坏，或者电缆很旧，请将其换成替代品。这有时可以立即解决显示器显示的任何问题。
也可能存在电源问题，导致显示器无法正常工作。如果您的显示器显示无信号错误，那么您可以假设您的显示器已通电，但如果您的 PC 未打开，您将不会看到任何错误显示。
显示器输入源是否正确？(Is The Monitor Input Source Correct?)
显示器上的无信号错误可能表明您的 PC 显示器正在忽略 PC 的图形输出。如果显示器上的输入源设置为错误的设备，有时会发生这种情况。
大多数显示器都有多个可用的输入源，包括VGA、HDMI和DVI输入。这允许您将多个设备连接到同一显示器。这可以是多台 PC，或者是一台 PC 和一个游戏机(PC and a games console)，然后您可以使用显示器的固件菜单或物理控件在它们之间切换。
如果是这种情况，请确保显示器上的输入源设置正确。如果不是，请切换到正确的源（例如，现代 PC 的HDMI或DVI）以使您的显示器再次工作。
检查显示器分辨率(Check Monitor Resolution)
PC 显示器具有一组显示分辨率范围，可用于显示 PC 输出。如果您的 PC 显卡设置为高于显示器能够显示的显示分辨率，您可能会看到空白屏幕或出现无信号消息。
值得庆幸的是，在更改显示设置后修复空白显示器屏幕是一个简单的过程。(fixing a blank monitor screen)如果您自己更改设置后显示器突然失去分辨率，请等待 15 秒 - 在此之后 Windows 将恢复为您之前的分辨率。
如果您最近没有更改显示设置，那么您的显示器分辨率可能已自动更改。有一些方法可以解决这个问题，包括重新启动Windows并启动到安全模式以更高分辨率绕过问题。
默认情况下，Windows在(Windows)安全模式(Safe Mode)下将使用比正常使用时低得多的显示分辨率。这将允许您将标准显示分辨率更改为您的显示器可以支持的较低设置。
如果您不确定您的显示器支持哪些分辨率，您应该查阅您的用户手册或制造商网站以找出答案。或者，使用 15 秒的窗口来更改您的分辨率，以进行一些试错。如果该分辨率使您的显示器无法工作，Windows会将设置恢复为之前有效的设置。
更新您的显卡驱动程序(Update Your Graphics Card Drivers)
当出现显示问题时，显示器本身通常是您诊断工作的重点，但您的 PC 使用的显卡通常是更大的罪魁祸首。如果您在新显示器上看到空白屏幕，则很可能需要安装新的显卡驱动程序。
正如我们上面所解释的，您的 PC 有时可以使用超出显示器支持范围的分辨率。同样，您的显示器有时可以支持您的显卡尚不支持的分辨率，尤其是当您要转向 4K 显示器或从60Hz 显示器转向 240Hz 显示器时(60Hz to a 240Hz display)。
值得庆幸的是，这通常可以通过更新显卡驱动程序来解决（只要显卡相对较新）。建议您定期更新驱动程序以获取新功能和错误修复。这包括对新显示器和显示分辨率的支持。
例如，如果您有NVIDIA显卡，您可以使用Windows Update轻松(Windows Update)更新您的 NVIDIA 驱动程序(update your NVIDIA drivers)，或者，对于最新的驱动程序，可以直接从NVIDIA网站下载它们。
使用替代显示器或 PC 进行测试(Test With An Alternative Monitor Or PC)
如果您确信不存在导致显示器没有信号的软件问题（如过时的驱动程序），那么您可能需要尝试使用替代显示器或 PC 作为故障排除工作的一部分。
将连接到 PC 的显示器更换(Replace)为备用显示器（如果有可用的）。如果问题被复制，这可能表明您的 PC 存在问题，您需要进一步诊断。
同样，如果您的主显示器停止工作，但备用显示器工作正常，则这可能表明您的显示器硬件存在问题。但是，这并不一定排除进一步的软件问题。例如，过时的驱动程序或不正确的显示分辨率仍可能导致此故障，因此您需要进一步调查。
更换您的硬件(Replace Your Hardware)
经过彻底的测试，如果您已经用尽了潜在的软件修复，并且您的硬件的任何问题都可以通过其他连接的设备进行复制，那么您需要考虑更换您的硬件。
例如，损坏的显卡可能会停止显示器的任何显示输出，从而导致无输入信号。如果驱动程序没有问题，则需要更换显卡(replace your graphics card)。
同样，不能与多个设备一起使用的损坏的显示器也不会自行修复。您应该查看保修期内的维修选项，否则，请考虑购买新显示器。
如果您的显示器闪烁(if your monitor flickers)或有迹象表明设备开始出现故障，这也是一个值得的决定。例如，如果您的显示器需要很长时间才能打开，就可能出现这种情况。
修复 PC 硬件问题(Fixing PC Hardware Issues)
当监视器显示无输入信号错误消息时，不要惊慌。上述步骤应该可以帮助您解决问题，但您可能需要进一步诊断您的显示器(diagnosing your monitor)或 PC，以考虑您是否需要在设备保修范围内进行更换或维修。
投资于正确的 PC 硬件(Investing in the right PC hardware)至关重要——您不希望在未来一两年后陷入同样的境地。便宜(Cheap)并不总是具有成本效益，但在您急于购买新的 PC 组件或全新的 PC 或显示器之前，请务必仔细考虑您的预算。
6 Troubleshooting Tips When Your PC Monitor Has No Signal
Plug іt in, switch it on—it sоunds easy enough to get your PC running, but it isn’t always that easy. It doeѕn’t matter if your PC fans are spinnіng if you’re seeing nothіng on your monitor that allows you to actually use it. A no signal error on a monitor can leave you scrаtching your heаd without answеrs.
Thankfully, this kind of problem is usually easy to troubleshoot. If some of the more common fixes don’t work, then it points to a likely hardware fault that you’ll need to investigate for repair or replacement. To help you deal with display issues, here are some troubleshooting tips you can try when your PC monitor has no signal.
Check Your Cabling and Power
Before you rush to rip out your graphics card or head to Amazon to buy a new monitor, you should look carefully at your PC and monitor to ensure you have no cabling or power issues.
This is a simple check to complete. Start by tracing the cabling between your monitor and PC to ensure that you have no loose connections. A loose HDMI cable, for instance, could be preventing the output from your PC from being displayed (and vice versa).
You may also find that the display cable itself is at fault. If you see cable damage, or if the cabling is quite old, swap it out for an alternative. This can sometimes immediately resolve any issue with your monitor display.
There could also be a power issue that prevents your monitor from working correctly. If your monitor is displaying a no signal error, then you can assume your monitor has power, but if your PC isn’t on, you won’t see any error displayed.
Is The Monitor Input Source Correct?
A no signal error on a monitor could be a sign that your PC monitor is ignoring the graphics output from your PC. This can sometimes happen if the input source on your monitor is set to the wrong device.
Most display monitors have multiple input sources available, including VGA, HDMI, and DVI inputs. This allows you to connect multiple devices to the same display. This could be several PCs, or a PC and a games console, which you could then switch between using your monitor’s firmware menu or physical controls.
If this is the case, make sure that the input source on your monitor is correctly set. If it isn’t, switch to the correct source (for example, HDMI or DVI for modern PCs) to get your monitor working again.
Check Monitor Resolution
A PC monitor has a set range of display resolutions that it can use to display your PC output. If your PC’s graphics card is set to a display resolution above what your monitor is capable of displaying, you’ll likely see a blank screen or a no signal message appear.
Thankfully, fixing a blank monitor screen after changing your display settings is an easy process. If the monitor has suddenly lost resolution after changing the settings yourself, wait 15 seconds—Windows will revert back to your previous resolution after this point.
If you’ve haven’t recently changed your display settings, then your monitor resolution could have been changed automatically. There are ways to get around this, including restarting Windows and booting into Safe Mode to bypass the issue with a higher resolution.
By default, Windows will use a much lower display resolution in Safe Mode than during normal use. This will allow you to change your standard display resolution to a lower setting that your monitor can support.
If you’re unsure what resolutions are supported by your monitor, you should consult your user manual or the manufacturer website to find out. Alternatively, use the 15-second window to change your resolution for a bit of a trial-and-error. If the resolution stops your monitor from working, Windows will revert the setting to the previous setting that worked.
Update Your Graphics Card Drivers
When a display problem occurs, the monitor itself can often be the focus of your diagnostic efforts, but the graphics card your PC uses is often the bigger culprit. If you’re seeing a blank screen on a new monitor, then it’s likely that a new graphics card driver is in order.
As we’ve explained above, your PC can sometimes use a resolution outside of the range supported by your monitor. Equally, your monitor can sometimes support resolutions that your graphics card doesn’t yet support, especially if you’re moving to a 4K monitor or from a 60Hz to a 240Hz display.
Thankfully, this is often resolved by updating the graphics card drivers (so long as the graphics card is relatively new). It’s recommended that you update your drivers on a regular basis to gain access to new features and bug fixes. This includes support for new monitors and display resolutions.
For instance, if you have an NVIDIA graphics card, you can easily update your NVIDIA drivers using Windows Update or, for the latest drivers, by downloading them from the NVIDIA website directly.
Test With An Alternative Monitor Or PC
If you’re confident that there isn’t a software issue (like outdated drivers) causing no signal to your display, then you may need to try an alternative monitor or PC as part of your troubleshooting efforts.
Replace the monitor attached to your PC with a spare (if you have one available). If the problem is replicated, this would likely indicate a problem with your PC that you’ll need to diagnose further.
Likewise, if your main monitor stops working, but a spare works fine, then this could indicate a problem with your monitor hardware. However, this does not necessarily rule out a further software issue. For instance, outdated drivers or incorrect display resolution could still cause this fault, so you’ll need to investigate further.
Replace Your Hardware
After thorough testing, if you’ve exhausted potential software fixes and any issues with your hardware can be replicated with other attached devices, then you’ll need to consider replacing your hardware.
For instance, a broken graphics card could stop any display output to your monitor, resulting in a no-input signal. If the drivers aren’t the problem, you would need to replace your graphics card.
Likewise, a broken monitor that doesn’t work with multiple devices isn’t going to fix itself. You should look at your repair options under warranty or, failing that, consider buying a new monitor.
This would also be a worthwhile decision if your monitor flickers or there’s a sign that the unit is starting to fail. This might be the case if your display takes a long time to switch on, for instance.
Fixing PC Hardware Issues
When a monitor displays a no input signal error message, don’t panic. The steps above should help you troubleshoot the issue, but you may need to look at diagnosing your monitor or PC further to consider whether you’re due a replacement or repair under your device warranty.
Investing in the right PC hardware is essential—you don’t want to end up in the same situation a year or two into the future. Cheap isn’t always cost-effective, but make sure to consider your budget carefully before you rush to buy new PC components, or a new PC or monitor entirely.
