HT2173 iMac G5 2005. It lights up when the power is pressed but then goes off again with a second or two and then nothing happens . Any body knows whats happening? Please help.

Please can any help me. My iMac G5 2005 version has just pack up on me. When I press the start button the front light comes on and then disappears within a second and it then goes quiet and nothing happens. Can any body help on what to do or explain what's going on.  Many thanks for your anticipation to help but reading my message hopefully you can get in touch if you know anything about what's going on.
Regards
Johnshaw168

The most obvious suspect is the PRAM battery.
Depending on precisely which G5 iMac you have:
How to replace the PRAM battery:
http://www.ifixit.com/Guide/Repair/iMac-G5-20-Inch-Model-A1145-PRAM-Battery/1153 /1#top
You could also try a SMU reset:
iMac G5: How to Reset the SMU
http://support.apple.com/kb/HT1767

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