After that, you can use your QuickTime Player to play Fix 2: Reinstall QuickTime Player You just need to restart your Windows or Mac. Recommendation: Why Rebooting a Computer Fixes Problems? Answers Are Here. Some of them are unnecessary and they even cause problems. Besides, many files are just running in the background. These files can be the cause of QuickTime Player won’t play files. For example, there may be some residual files that remained on your computer but you don’t know this. When you are using your Windows or Mac, your operations will produce some temporary and cached files.

Scan your computer for viruses and malware.

What to Do if QuickTime Player Won’t Play MP4? Before doing this, you’d better figure out why this problem occurs. If QuickTime Player is not working on your computer, you need to take measures to fix it. For example, you may find it can’t play MP4 files or other types of videos.

But this doesn’t mean that it will not malfunction.

Yes, some of you prefer to use QuickTime Player on Windows computers. If you are using a Windows computer, you need to go to the Apple QuickTime download page to download and install it on your device.

But Apple stopped support for the Windows version of QuickTime in 2016 and stopped support for the Mac version of QuickTime in 2018. It has both Windows versions and Mac versions. You can use it to play different formats of videos, pictures, audio files, panoramic images, and interactivity. QuickTime Player is an extensible multimedia framework that is developed by Apple Inc.

Quicktime player 7.6.6 mac