Imac 20" just stopped working - just switches off

Hi I'm running an imac 20" intel and its about a year old - I've had no problems with it until now - I installed ilife 08 last week and also added a 4 port USB extender cable but it worked ok for a few days after.....Now it has suddenly started turning itself off and I have to unplug the power cable before turning on again and even then it starts to boot and then switches off........fortunately I backed everything up the first time it did it but is it the power cable or a computer issue? I'm in Singapore...
Thanks for the help
I'm running OSX Tiger and am fully updated.

my imac does the same thing. have you gotten any resolution to this? I have had my mac only working first 2 months after i bought it.been sitting in box in closet now for over a year. Because it just "stopped working" . turns on -get the apple screen then click -off. help if u got any.

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Message was edited by: Michelasso - Wrong spelling

HI,
i just answered this myself, googled it and found a article on mac website that told me a simple reinstall of the battery was all that was required and it worked!!
many thanks,
brian.

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Imac 20" just stopped working - just switches off

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