IMac G5 blinking power light / won't turn on

When my iMac G5 is hooked up to power, the power light (front bottom right panel) faintly blinks once every 2 seconds or so. The monitor is not on at all, and the computer does not appear to be running (no sounds).
All other devices hooked up to that particular power outlet are working fine, and pressing the power button does nothing. Holding the power button down halts the blinking, but when I let go the blinking resumes.
I have also tried removing all devices attached to the computer, including the keyboard and mouse.
This machine was working fine on friday, but when I came back into work today (monday) the machine was 'off' and nothing I do seems to cause any change.
Very confused, any help appreciated.

It may be that your Power Supply Unit is failing, look at the suggestions here, try them and if nothing works, call Apple. If you have a Rev A, you may qualify for the Repair Extension Program. (sorry to assume you didn't know about sleep, sometimes very basic things are not known to posters).
Please let me know how you make out,
Miriam

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