Pwer Mac G5 won't automatically go to sleep

I have had my Power mac G5 for over a year now. I am running OSx Tiger. 2 days ago I returned from a long vacation, switched on my mac and it prompted me to do an OSX security patch upgrade which I went ahead and did.
In the past I have had the power preferences setting set to put the Mac and monitor to sleep after 10 mins of inactivity. It has always worked perfectly!
Now after my return from vacation the automatic sleep doesn't kick in!
If I manually put it to sleep from the system drop down, then it goes to sleep.
Has anyone got any advice to get the automatic sleep feature working again?
Many thanks for any help,
Steve.
Power Mac Dual G5 2GHz   Mac OS X (10.4.1)  

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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