iMac won't turn on - Nothing!

[CottonFields]

This is an older grape iMac. Admittedly, I haven't used it for some time,
geez, maybe 9 mos! I've tried to start it, but nothing happens. I've plugged it in to three different outlets [verifying there's power to each outlet]. I've tried three different power cords. Still - nothing.
What can I do???

 

[CharlieJ]

You don't get lights or anything?!

It sounds as if your powersupply has died..
Has it been left outside by any chance?

Charlie

 

[CottonFields]

Charlie - No lights, [camera or action or sound]: Nothing! It sits there, OFF, just the same, whether On button is pushed or not.