Problem Awakening Display From Sleep

I just bought my first Apple last saturday,an iMac 17".Here`s my problem, I set up the display to sleep after 5 minutes.Right after it goes to sleep, if I move the mouse the display will turn on again OK,however, once again the displays goes to sleep, if I leave it alone for a long period of time (say a couple of hours) if I move the mouse to awake the display,the display remains dark blue.I can see the cursor,but nothing else.I`ve tried pressing keys,clicking the mouse,anything to awaken the computer,to no avail.
I`ve also made sure that in preferences,the computer is "never put to sleep".I did though,checked the box that says "put the hard disk to sleep when possible",thinking that one thing did not affect the other.
Or is it?
Ultimately, I had to resort to shutting down the computer (pressing and holding the power button for 5 seconds) and the starting it up again.
My operating system is up to date,so this is not the cause of this bug.
Does anyone have the same problem?
iMac 17" Intel Core Duo Mac OS X (10.4.5)

Some other people are having sleep issues associated with keyboard and USB problems. The following thread may give you a bit more information:
http://discussions.apple.com/thread.jspa?threadID=340067&tstart=15
iBook G3 800Mhz, iMac Core Duo 17" Mac OS X (10.4.5)

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