KEEPS FALLING ASLEEP

hi, the mac keeps just falling asleep as i am working away. i am down to about 30 gb left on the hd. i have checked the settings for sleeping and they are set to go to sleep after 10 minutes and also i have checked the hot corners too. a click gets things going again.
any comments greatly apreciated.
ta
imac G5 flat screen Mac OS X (10.4.10)

Look and see if you fit the parameters of Apple's power supply or video and power issues warranty extension.
Miriam

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