Macbook pro will not play any videos

Hi,

Resetting NVRAM could resolve the issue.

https://support.apple.com/en-us/HT204063

The problem can arise due to many reasons

1. It can be possible that you changed your browsers settings.
2. Also you’ve installed some which are buggy.

Follow below listed steps to reset your browser. It may fix the problem

1. Click on “Safari” located in the menu bar in the top left hand corner of the screen

2. Click on “Reset Safari...”

3. Place a checkmark beside all available options

4.Press the “Reset” button

5. Click on the Hard Drive icon located on the desktop

6. Browse to “Users > (Users Home) > Library > Safari folder”

7. Drag every file except “Bookmarks.plist” into the Trash

8.Browse to “User > (Users Home) > Library > Preferences”

9.Locate “com.apple.Safari.plist”, “com.apple.internetconfigpriv.plist” and “com.apple.internetconfig.plist” and drag them to the trash. NOTE: If “com.apple.internetconfigpriv.plist” does not exist, ignore it and just trash the other two files

10. Restart Safari

My other thoughts on your problem!! This error means that, the particular site has been blocked from accessing. I usually face this problem in company, as they have blocked several sites like Facebook Login, Youtube Login. we can only accesss mycoles employee login Still, to be sure, clear all history and cache of your browser, and try again. If the problem persists, check your system date and time, a wrong date and time can create problems for your browser to obtain security certificates.