G5 Won't automatically go to sleep after installing Leopard

I have my power savings prefs set to about 5 mins to put my G5 to sleep.
I checked to see if this was working on Tiger immediately before upgrading to Leopard.
Now that I've upgraded to leopard my G5 won't automatically go to sleep. I can force it to sleep from the menu bar.
I have tried switching time machine off, and that doesn't have any effect.
Has anyone got any ideas that would help me to get my power saving sleep setting to work again?
The reason that I need it on my G5 is that where I have it positioned does no have wonderful ventilation and it tends to get a bit hot if I leave it on all day.
Hence the power save/sleep is a feature that I really use a lot!
Thanks for any help,
Steve

Another thing to check is whether you have DVD Player open. This will prevent your Mac from going to sleep.
If this is not the case, the next step would be to reset your NVRAM. You can find instructions on how to do this by reading this article:
http://docs.info.apple.com/article.html?artnum=2238
PowerMac G5 Mac OS X (10.4.6) 1GB RAM, nvidia 6800 ultra, Apple 30" Cinema Display

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G5 Won't automatically go to sleep after installing Leopard

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