On Jun 5, 2012, at 7:16 PM, Jesse Stjohn wrote:

> apple DVD player won't work due to error 21, some tripe about having to stop 
> using other programs, or I don't have the hardware to use the software. 
> Whatever. My video is Not the rage or rage pro but the radeon 7000. I do have 
> updated drivers from ati and it is as good as Mac os 9 gets.  Any help would 
> be nice and apple DVD ver is 1.2

This is OS 9, make sure there isn't some bit of a program like Toast or 
something in the extensions that's glomming onto the DVD. I've seen this in the 
past as well (although this was in OS 8 not 9) when a failed burn left bits 
laying about.

Error -21 is "Driver ref num doesn't match unit table" per Apple's old error 
codes <http://support.apple.com/kb/HT1618?viewlocale=en_US&locale=en_US>, which 
sounds like an issue with the drive, as well. 

Does it read a data disk? COuld it simply be a failing DVD drive?

If it's not one of those, what I'd usually do is re-apply the latest combo 
update for OS 9, replace the various bits that might be corrupted.

I'm sure there's some troubleshooting steps I'm forgetting, it's been a long, 
Long time since I messed with the classic OS...

-- 
Bruce Johnson

"Wherever you go, there you are" B. Banzai,  PhD

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