Display turns black for around 10 seconds

I just encounter this problem twice in a day, it happens without any warning:
First the display of my macbook turns black suddenly without any warning and can last for around 10 seconds before wakes up again. During this time, I can hear the noise of hard disc or fan but it seems that the display does not respond to the keyboard. My battery is full and the power adaptor is connected.The power saving is on, but I do not think that is the cause since my finger is keeping moving on the touchpad all the time and the display does not respond to the keyboard as it should when shutting down for power saving.
I was browsing the web before these accident and the model of my Macbook is Macbook2,1; It is 16 months old and runs Tiger 10.4.11.
Currently my macbook function normally but I do not sure if this accident indicates some big problem. I have checked the troubleshooting section but all the related article is about more serious problem. Has any one here ever encountered the same problem before? Does that serious?
Thank you very much for all possible help!

Do you have an Apple Care extended warranty because it sounds like the begining of inverter failure. If it is a bad inverter, that is a hardware failure and can't be fixed with software.

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