Imac G5 - Sleep mode won't work!

Hey guys!
I bought my iMac in December 2004. Usually, whenever I put my computer to Sleep mode, I will see the pulse light and everything works fine. When I click on the mouse, the screen will turn on and it will display my desktop or however I had left it. But until recently, sleep mode still kind of works, but instead of going back to where I have left it, it turns back on as if I had restarted my computer! I've tried the SMU and there's no progress. Then, today, my computer just would not turn on at all until I've unplugged everything from it and did the SMU. Do you think that I will need to bring it to an Apple store to fix the sleep problem?
Please let me know if there's anyway to fix it.
Legna
iMac G5   Mac OS X (10.3.9)  

Hey thanks for your replies guys!
Well, weirdly, sleep mode worked today! But I will look up my serial number just to make sure that I got the extended warranty or not on the REV A (what's that exactly?) But then my boyfriend was telling me that it might have something to do with the power supply. Before I posted my question, I have my computer plugged to a power bar. After the incidence when my computer wouldn't turn on, I plugged it directly to the power jack. Could that be a cause as well? I've also unpluged my iSight from it. I'm not sure if those could be possible causes of it. Please let me know.

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