Revhead

I have exactly the same problem. I've tried everything. After installing XP Pro SP1 my Samsung DVD ROM SD-616F just refuses to play DVDs. It'll play music CDs without a problem but it just won't have a bar of any DVD - I'm using PowerDVD XP 4.0 with the lastest patch installed. The drive was working just fine under W2K before I did a fresh install of XP to a different drive. Since then I've upgraded to the latest firmware. I've uninstalled the thing, gone through the registry and deleted any references to it (there was one under Local Machine\System\ControlSet002\Enum\IDE that it wouldn't let me delete), then I shutdown, unplugged the thing and rebooted a couple of times without it connected. After doing all this I then reconnected it, Windows found it again but it still refuses to play DVDs. This seems to be a common problem from what I can see but I have been unable to find a difinitive answer. Can anyone out there help - this is driving me batshit.