My Mac doesnt play Dvd's

Whenever I put a DVD in my computer it never plays, it only shows up on my home screen. It used to play the DVD's but now it will not let me watch them.

First, Safe Boot , (holding Shift key down at bootup), use Disk Utility from there to Repair Permissions, test if things work OK in Safe Mode.
Then move these files to the Desktop for now...
/Users/YourUserName/Library/Preferences/com.apple.finder.plist
/Users/YourUserName/Library/Preferences/com.apple.systempreferences.plist
/Users/YourUserName/Library/Preferences/com.apple.desktop.plist
/Users/YourUserName/Library/Preferences/com.apple.recentitems.plist
/Users/YourUserName/Library/Preferences/com.apple.digihub.plist
Reboot & test.
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.
Hmmm
There's a possibility that this file is involved also...
/Library/Caches/com.apple.LaunchServices-xxxxxxxx.csstore
There may be mutiple numbered ones.

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