Blue Screen instead of sleep

I experienced a strange behaviour of my iMac G5 (isight) the last few days:
I set the iMac to first display the screensaver after 10 minutes, then to go to sleep after 45 minutes. Now, the saver shows up, no problem. But then, instead of going to sleep the screen just turns to a bright blue an thats it. When i move the mouse, the desktop will appear again and i can work as usual. But i don't know if it is good when my iMac just turns the display into blue instead of really going to sleep.
Sometimes it works, and it goes to sleep with the white light flashing. But in about 50% or more of the cases, it's just a blue screen and the Mac is not in sleep as i can hear the fans and the HD.
What can i do?

Thanks for your feedback. The same thing here.
When my iMacs goes to sleep as ist should (which happens some times ) then at the wake up, there is a light blue screen for several seconds. When i move the mouse or hit a key, then the desktop will appear again, and everything seems to be ok.
But this is really strange.
PowerBook G4 1.33 GHz, iMac G5(isight) 2.1 GHz   Mac OS X (10.4.3)  

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    Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
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