Boot from the Restore disks or from an OS X installation disk and run Disk Utility and Repair Disk.
If all is well, and the problem still exists, consider the following:
1. Delete the Finder Preferences. You will find them in your Home Folder>Library>Preferences. com.apple.finder.plist Just drag it to the desktop and reboot.
2. Archive and Install of the System using the OS X installation disk.
Hi all. Hopefully this is the correct place to post my question. Yesterday I inserted a movie DVD into the internal drive of my MacPro 3,1 and received the error message, "The disc you inserted is not readable by this computer". I tried several different movie discs, some old, some new releases I just purchased and I get the same message. Data discs work fine but not movie DVDs.
I also noticed that my Mac can no longer mount an ISO or DMG file. I get an error saying "No Mountable filesystems". I have repaired permissions, restarted, disconnected all external peripherals, etc. Pretty much all the basic stuff you try when your Mac isn't behaving as you'd expect. The odd thing is that it just started behaving this way within the last two days. DVDs played fine before and I could mount any ISO or DMG file. Only thing that is different is I ran the most recent security update from Apple when it popped up. Would welcome your thoughts, suggestions, etc.