Hi Bill,

Thanks very much for your reply on this.

I had seen this solution and I went through your steps but it appears that on Vista the "UpperFilters" and "LowerFilters" registry entries do not exist.

I have contacted the manufacturer support and went through their recommended steps which were a factory restore. As this did not work they are
sending me a new drive. Lets hope it is a hardware problem.

Kind regards,

Nick
 
> Date: Fri, 15 Feb 2008 00:58:56 -0500
> To: [log in to unmask]
> From: [log in to unmask]
> Subject: Re: [PCBUILD] DVD Drive Will No Longer Read CDs
> CC: [log in to unmask]
> 
> At 03:41 02/13/08, Nick Northall wrote:
> >I recently purchased a new PC running Windows Vista. It has an
> >LG DVD burner drive. After 2 weeks it suddenly stopped reading
> >CDs but will still read DVDs. The advice from the manufacturer
> >is to clear the hard disk and reinstall. This has also been
> >suggested by a local PC shop as apparently the registry can
> >get corrupted (?). Something to do with Windows losing the
> >drivers apparently. Has anyone experienced this ? Anyone got
> >a simpler solution ?
> 
> 
> Loosing part or complete CD and DVD functionality is apparently
> a common problem with Win2k, WinXP, and Vista. (See the MS
> article at <http://support.microsoft.com/kb/314060/EN-US/>.)
> 
> Here's the Registry fix described in the Microsoft article.
> I don't see that you have anything to loose by trying this.
> It worked for me. (I couldn't get my DVD and CDRW drives to
> read CD discs and the fix restored complete functionality.)
> The fix didn't cause any side effects. I've recommended this
> to five people and it solved the problem for four of them.
> 
> Open Regedit. (I don't have Vista, but in Win2k and Vista
> you type regedit into the Start, Run menu and hit Enter.)
> In Regedit, navigate to
> 
> HKLM\System\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFCl-087002BEl0318}
> 
> (Note that HKLM is short for HKey_LOCAL_MACHINE.)
> 
> In the left pane of the Regedit window, highlite this key by
> left clicking on {4D36E965-E325-11CE-BFCl-087002BEl0318}.
> 
> (Careful! There are many similarly named keys under
> HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\. Make
> sure you highlite the correct one, the one starting with 4D36E965.)
> 
> In the right pane of the regedit viewer you'll find two subkeys
> called "UpperFilters" & "LowerFilters". Delete the VALUES for
> these subkeys. (For example, right click on "Upperfilters" and
> choose "Modify" from the menu that appears. In the small data
> window that appears, drag your cursor to highlite everything,
> all the numbers and/or letters, and hit the Delete key. (Or
> right click on the highlited data and choose "delete".) You
> should be left either with nothing, or with 0000. Do the same
> thing for "Lowerfilters".)
> 
> There may be subkeys with similar names (like UpperFilters_1,
> LowerFilters_1, Upperfilters.bak, or LowerFilters.bak). These
> are backups. Don't mess with those.
> 
> Close Regedit and reboot the computer so that the changes that
> you made to the registry take effect. See if your drives can now
> read both CD and DVD discs.
> 
> Note: The Microsoft article mentioned above suggests that
> you DELETE (not just MODIFY) the entire registry entries
> "UpperFilters" and "LowerFilters".
> 
> If deleting only the values doesn't work, you might as well
> go back and completely delete "UpperFilters" and
> "LowerFilters". It's similar to what I wrote above.
> 
> In regedit, go to
> 
> HKLM\System\CurrentControlSet\Control\Class\ and highlite
> 
> {4D36E965-E325-11CE-BFCl-087002BEl0318}
> 
> Use your mouse to highlite the word "LowerFilters" in the
> leftmost column of the right pane of Regedit.
> 
> Right click on the name "LowerFilters" to bring up the
> small menu with choices Modify, Delete, Rename.
> 
> Choose Delete and left click it.
> 
> Repeat this for "UpperFilters", choosing "Delete" instead
> of "Modify".
> 
> My gut feeling is that if the optical drives are present
> in Device Manager as working properly (no yellow question
> marks), but the drives won't read CD and/or DVD discs,
> modifying (zeroing) the upper and lower filter values
> should be enough. If the optical drives aren't listed in
> Device Manager as working properly, then deleting
> UpperFilters and LowerFilters completely is called for.
> 
> Regards,
> Bill
> 
> 

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