I'm not sure there is a satisfying answer...some drives just get flaky and eventually need to be replaced. DVDs tend to be more sensitive to scratches, smudges, and residue, so of course it makes sense to clean them off with windex and a soft cloth, but I assume you've taken that route. Blowing out the drive with canned air couldn't hurt, although you should probably clean the lens again afterward in case the air blows dust onto it. You've cleaned the lens, and tried various types of DVDs, so there isn't really much more to be done.
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I can't imagine the OS or any apps would be the cause, but I'd be curious if the Snow Leopard DVD would show up if you tried to boot in the option menu (hold option as you boot)? If it shows up in the option menu but not in the OS, that might tell us something.
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I can't imagine the OS or any apps would be the cause, but I'd be curious if the Snow Leopard DVD would show up if you tried to boot to the option menu (hold option as you boot)? If it shows up in the option menu but not in the OS, that might tell us something.
I'm not sure there is a satisfying answer...some drives just get flaky and eventually need to be replaced. DVDs tend to be more sensitive to scratches, so of course it makes sense to clean them off with windex and a soft cloth, but I assume you've taken that route. Blowing out the drive with canned air couldn't hurt, although you should probably clean the lens again afterward in case the air blows dust onto it. You've cleaned the lens, and tried various types of DVDs, so there isn't really much more to be done.
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I'm not sure there is a satisfying answer...some drives just get flaky and eventually need to be replaced. DVDs tend to be more sensitive to scratches, smudges, and residue, so of course it makes sense to clean them off with windex and a soft cloth, but I assume you've taken that route. Blowing out the drive with canned air couldn't hurt, although you should probably clean the lens again afterward in case the air blows dust onto it. You've cleaned the lens, and tried various types of DVDs, so there isn't really much more to be done.
I can't imagine the OS or any apps would be the cause, but I'd be curious if the Snow Leopard DVD would show up if you tried to boot in the option menu (hold option as you boot)? If it shows up in the option menu but not in the OS, that might tell us something.
I'm not sure there is a satisfying answer...some drives just get flaky and eventually need to be replaced. DVDs tend to be more sensitive to scratches, so of course it makes sense to clean them off with windex and a soft cloth, but I assume you've taken that route. Blowing out the drive with canned air couldn't hurt, although you should probably clean the lens again afterward in case the air blows dust onto it. You've cleaned the lens, and tried various types of DVDs, so there isn't really much more to be done.
I can't imagine the OS or any apps would be the cause, but I'd be curious if the Snow Leopard DVD would show up if you tried to boot in the option menu (hold option as you boot)? If it shows up in the option menu but not in the OS, that might tell us something.