(Are)尝试在Mac OS X(Mac OS X)中播放YouTube视频或 Flash 内容时出现空白或黑屏？在线(solution online)搜索解决方案后，我遇到了很多故障排除步骤，但似乎没有一种解决方案可以修复空白视频播放器(blank video player)错误。但是，在进行了一些额外的故障排除后，我找到了一种解决方法，它利用了一些基本的故障排除步骤。
视频或 Flash 游戏(video or flash games)无法在Mac OS X中的(Mac OS X)Safari、Firefox 或 Google Chrome(Firefox or Google Chrome)等浏览器中运行的问题主要与Adobe Flash Player的设置和兼容性问题有关，该软件使这些基于 Web 的视频能够播放。使用以下故障排除步骤，您应该能够在Mac 计算机上运行 Flash(Mac computer)视频和游戏(video and games)。
请注意，YouTube真的不再使用 Flash(use flash)，所以没有人真的应该再遇到这个问题了。但是，还有许多其他站点仍然依赖闪存，因此以下步骤可以帮助解决这些站点上的问题。
1.卸载并重新安装Adobe Flash Player(Uninstall and Reinstall Adobe Flash Player)（确保您安装的是最新版本）
这可能会解决Flash 视频问题(flash video issue)，也可能不会，但值得一试。首先(Start)跳转到官方 Adobe 网站(official Adobe website)并下载适用于OS X的 flash Player 卸载(Player uninstaller)程序。启动卸载程序，只需从Mac中卸载(Mac)Flash Player并重新启动计算机。
在您的计算机重新启动并登录后，请前往Adobe.com下载最新版本的Flash Player。重新安装(Reinstall)并检查YouTube视频是否正常工作。
2. 在 Chrome/Safari 中启用 Flash
在Chrome中，点击右上角的三个点，然后点击(right and click)设置(Settings)。向下滚动并单击高级(Advanced)将其展开。在隐私和安全( Privacy & Security)下，单击内容设置(Content Settings)。
向下滚动到Flash，然后切换控件，使其显示Ask First (recommended)。
如果您已经为Safari安装了(Safari)Flash，但仍然无法正常工作，您可能需要先启用该插件。为此，请打开Safari，然后单击顶部的Safari并单击(Safari)Preferences。
单击网站(Websites)选项卡，左侧面板底部应该有一个名为插件的部分。( Plug-ins)确保(Make sure)选中Adob e Flash Player 。(Adobe Flash Player)如果此处未列出，请务必先访问Adobe Flash 网站(Adobe Flash website)并下载最新版本的Flash。
默认情况下，您必须逐个站点(site basis)启用它。您可以看到它启用的网站列表，在底部，您可以选择是否为所有其他网站启用或禁用Flash 。
3.重置 Safari(Reset Safari)、Firefox、Chrome 和清除缓存(Chrome and Clear Cache)
如果Flash Player仍然无法正常工作，您可能需要尝试清除浏览器的缓存、退出浏览器并重新启动。有些人报告说，视频将在清除缓存后正常工作。
在Chrome中，您可以单击三个点，然后单击更多工具( More Tools)并选择清除浏览数据( Clear Browsing Data)。确保选中缓存( Cached images and files)的图像和文件，然后单击清除数据(Clear Data)按钮。
4. 启用Javascript 并禁用弹出窗口拦截器(Javascript and Disable Popup Blocker)
很多Flash 内容(Flash content)都需要Javascript，因此如果您有阻止Javascript运行的扩展程序，则需要禁用它。您还需要进入浏览器设置并确保启用了Javascript 。
您还可以尝试为您遇到问题的特定站点禁用弹出窗口阻止程序。(popup blocker)完全禁用弹出窗口阻止(popup blocker)程序不是一个好主意，因为它会使您的计算机安全性降低。
5.禁用Flash硬件(Flash hardware)加速。
在无法正常工作的空白YouTube 视频(YouTube video)的屏幕上，右键单击(right-click)视频通常会显示的区域以调出Flash Player 上下文(Flash Player context)菜单。从菜单中选择设置(Settings)选项。 取消(Unselect)选择启用硬件加速(Enable hardware acceleration)选项并单击关闭(Close)按钮。
如果您没有看到右键单击内容菜单(content menu)，只需访问此Adobe 帮助页面(Adobe help page)并右键单击Flash 徽标(Flash logo)。如果您没有看到Flash 徽标(Flash logo)，则表示Flash未正确安装。
完全关闭浏览器，重新启动并再次测试Flash 内容(Flash content)以查看它是否可以播放。
6. 检查 HTML 5 YouTube 设置
YouTube 现在完全支持HTML 5，只要您运行的是相当新版本的浏览器，所有功能也应该得到完全支持。
如果您访问此 URL， https://www.youtube.com/html5HTML 5功能的复选标记。如果此处未检查某些内容，则表示您的浏览器非常旧，需要更新。
希望这篇文章能帮助您解决OS X中的空白视频播放器和无法运行的Flash 应用程序(Flash apps)的问题。如果您有任何其他故障排除建议，请随时发表评论。享受！
Fix Black or Blank Screen and Flash Videos Not Playing
Are you getting a blank or black scrеen when trying to play YouTube videos or flash content in Mac OS X? Upon searching for a solutiоn online, I’ve run across quite a few troubleshooting steps, but no one solution seemed to fix the blank video player errors. Hоweνer, upon doing a bit of additional troυbleshooting, I found a workaround, which utilizes a few basic troubleshooting steps.
The problem with video or flash games not working in browsers like Safari, Firefox or Google Chrome in Mac OS X mainly revolves around a combination of settings and compatibility issues with Adobe Flash Player, the software that enables these web based videos to play. Using the following troubleshooting steps, you should be able to get flash video and games working on a Mac computer.
Note that YouTube really doesn’t use flash anymore, so no one really should be having this issue anymore. However, there are many other sites that still do rely on flash, so the steps below can help resolve issues on those sites.
1. Uninstall and Reinstall Adobe Flash Player (make sure you are installing the latest version)
This may fix the flash video issue and it may not, but it’s worth a shot. Start by jumping to the official Adobe website and downloading the flash Player uninstaller for OS X. Launch the uninstaller and simply uninstall Flash Player from your Mac and restart the computer.
Once your computer boots back up and you’re signed in, proceed to Adobe.com to download the latest version of Flash Player. Reinstall and check to see if YouTube videos are working.
2. Enable Flash in Chrome/Safari
In Chrome, click on the three dots at the top right and click on Settings. Scroll down and click on Advanced to expand it. Under Privacy & Security, click on Content Settings.
Scroll down to Flash and then toggle the control so that it says Ask First (recommended).
If you have already installed Flash for Safari, but it’s still not working, you may have to enable the plugin first. To do this, open Safari and then click on Safari at the top and click on Preferences.
Click on the Websites tab and there should be a section called Plug-ins at the bottom of the left panel. Make sure that Adobe Flash Player is checked. If it’s not listed there, make sure to go to the Adobe Flash website and download the latest version of Flash first.
By default, you’ll have to enable it on a site by site basis. You can see the list of sites it’s enabled for and at the bottom, you can choose whether Flash will be enabled or disabled for all other websites.
3. Reset Safari, Firefox, Chrome and Clear Cache
If Flash Player is still not working properly, you may want to try clearing your browser’s cache, exiting the browser, and restarting. Some people have reported that videos will work properly upon clearing cache.
In Chrome, you can click on the three dots, then click on More Tools and choose Clear Browsing Data. Make sure to check Cached images and files and then click the Clear Data button.
4. Enable Javascript and Disable Popup Blocker
A lot of Flash content requires Javascript, so if you have an extension that is blocking Javascript from running, you will need to disable it. You’ll also need to go into the browser settings and make sure Javascript is enabled.
You can also try disabling the popup blocker for the particular site you are having issues on. It’s not a good idea to disable the popup blocker completely as it’ll make your computer less secure.
5. Disable Flash hardware acceleration.
While on the screen of the blank YouTube video that is not working correctly, right-click the area where the video would normally show up to bring up the Flash Player context menu. Select the Settings option from the menu. Unselect the option Enable hardware acceleration and click the Close button.
If you are not seeing the right-click content menu, simply visit this Adobe help page and right-click on the Flash logo. If you don’t see the Flash logo, that means Flash is not installed properly.
Close out of the browser completely, relaunch and test the Flash content again to see if it plays.
6. Check HTML 5 YouTube Settings
YouTube now supports HTML 5 fully and as long as you are running a fairly recent version of your browser, all the features should be fully supported too.
If you go to this URL, https://www.youtube.com/html5, you should see check marks for all the different HTML 5 features. If something is not checked here, that means your browser is very old and needs to be updated.
Hopefully, this post will help you to troubleshoot blank video players and non-working Flash apps in OS X. If you have any other troubleshooting recommendations, feel free to leave a comment. Enjoy!
