Some DVD's Won't Mount (Int or Ext Drive) Unless Re-Start

Intel 20" Core Duo iMac - OS X 10.4.7 (occurred with 10.4.6 as well)
A number of times now, I've seen this scenario:
Insert a DVD into either the internal SuperDrive, or my external Mad Dog firewire drive. Disc spins up, . . that's it. Never mounts.
At this point, no DVD is recognized in either drive (that is to say, it won't mount).
Re-start the Mac, put a known good DVD in either drive, and it works fine/mounts.
It seems as though a scratched or otherwise un-readable DVD is what kicks off this process, but what I find odd is that regardless of which drive I first encounter the problem with, there is no "seeing" a DVD in either drive unless I re-start.
Because I see the same thing with both drives, I'm feeling pretty certain it's not hardware, and I have repaired permissions. Any suggestions?
Thanks!
Mark

I was having a problem with playing homebrew DVDs--they would load/mount OK, DVD player would start, but they wouldn't play without painful pauses and skips. I saw a piece advice somewhere about going to System Preferences, bring up the CDs & DVDs pref pane, and in the "When you insert a video DVD" preference click on the drop down menu and select "Ignore" (of all things--sounded like a weird choice to me!). After changing this setting to the recommendation my DVDs would play just fine, I just had to launch DVD Player myself rather than it automatically opening. Don't know if this would help your problem, but it is easy to do, so you might give it a try.
Francine
Francine
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Some DVD's Won't Mount (Int or Ext Drive) Unless Re-Start

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