DVD fails to mount, tray opens

DVD fails to mount on internal DVD player (PIONEER DVD-RW DVR-106D shipped with G5). After several seconds, tray opens. Problem is that unless the DVD mounts, it cannot be duplicated. Any suggestions? I can burn new DVDs with DVD Studio Pro. Just unable to load, mount and play DVD on the system. Thank you.
Jeanne

Hey there Tramble... You seem to of had close to what my problem is. Just wanted to get your thoughts on it. CD works just fine, reads and burns no problem. DVD will not read or burn and no mount. Was your CD working? Wonder if there is a reason why one will work and the other wont... Either way the price of a laser cleaner may be worth the try.
Thanks!

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http://www.maciverse.com/install-os-x-snow-leopard-from-usb-flash-drive.html
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What's Happening?? Some days after installing latest security up date for 10.5.8 on G4, both inernal CD/DVD drives failed to mount disks other than a cleaning disk which mounted and was imported into iTunes.No other CD or DVD disk will mount.

What's Happening?? Some days after installing latest security update for 10.5.8 on G4, both inernal CD/DVD drives failed to mount disks other than a cleaning disk which mounted and was imported into iTunes. No other CD or DVD disk will mount.Is this a unique experience?

Hello Robert,
First, Safe Boot , (holding Shift key down at bootup), use Disk Utility from there to Repair Permissions, test if things work OK in Safe Mode.
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/Users/YourUserName/Library/Preferences/com.apple.systempreferences.plist
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Tom, you are nothing short of a genius!
It was the mouse. The mouse is fine on my G5 tower and on my wife's emac, but, for some reason that is certainly not known to me, it did not agree with my G4.
Now, before I mark the question as "answered", do you have any idea at all as to why the mouse would make such a difference? (It is an aftermarket mouse from China that blends with my white keyboard, but I had no hassles with the microsoft mouse from the G5, so it can't just be that it is not an apple mouse.)
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If there are problems with updating or with the permissions then easiest is to download the full version and trash the currently installed version to do a clean install of the new version.
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Hiya all,
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