Can't read dvd

I have some dvds I have recorded from old movies in the past. I know the content is good, they play on a dvd player, however, they read as a blank dvd on my imac. I want to edit them...any suggestions. Some of them read...even same brand of dvd...help:-)

Welcome to discussions!
Perhaps it isn't the media you are using, but, instead the manner in which you are burning.
(Thanks to Len Goff for the copy & paste):
Suggest you create a disc image and then burn the DVD. File/Save as Disc Image...
http://docs.info.apple.com/article.html?artnum=164927
This will isolate any encoding/burning issues you may encounter. Once the disc image is created, double-click the .img and burn the virtual disc that should appear on your desktop, using Toast to burn the DVD. Disk Utility to burn the .img file. Usually, you can select a burning speed in Disk Utility.
There are variations to this process based on which OS X you are using...
Open Disk Utility (in Utilities folder in Applications folder), click on the virtual disc (maybe the .img) in the left-hand window. Click the Burn icon. A new window should drop down and your SuperDrive tray will open after clicking the Burn icon. Insert a recordable DVD. (Verbatim DVD-R preferred by me.) Click the Close button. Wait. Select a burn speed. If you hold your mouse cursor over the pop-up it says: "Select a slower speed to work around burn failures," so select 4x or slower for best results. Then click the Burn button.
-->If the virtual disk selection won't allow you to click the Burn icon, use the .img file instead. This may have changed in 10.3.9 and did change in Tiger.
Also, you can use DVD Player to play the virtual disk to check your iDVD project before burning to DVD. Launch DVD Player. File/Open VIDEO_TS (Open DVD Media... in Player 4.6). Find the VIDEO_TS folder and open that. (The audio folder is for DVD-Audio disks.)
http://docs.info.apple.com/article.html?artnum=93006
Burning with the disk utility allows you to burn slower. That means a better play-back DVD.
Sue

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My usual steps include running a laser cleaning disk, remove/reinstall as you have done and maybe deleting upper & lower filters.Once done if it still doesn't work,it is declared dead.
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Have you fumigated your place lately? or around the time the machine stopped reading the DVD;s.
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http://forums.afterdawn.com/thread_view.cfm/244972
http://forum.digital-digest.com/archive/index.php/t-45081.html
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