I have some burned DVDs with home videos on them. When I put them in the DVD drive on my Mac desktop, they read as blank. The DVDs will play in a regular DVD player, so they do have content on them. I restarted the computer in 32 bit mode, and it worked (the system read the DVD). But after doing that one time, that work-around stopped working and the system reads the DVDs as blank even if I restart. Are there any other ways to get the system to read the DVD?