IMac won't stay shutdown, turns itself on after shutdown

hey i leave my imac on all the time and have done s since i bought it but i figure its eating up a fair bit of power, so i decided to start switching it off at night and when im not home etc... but when i shut it down (apple>shutdown) it turns off, and within a couple of minutes turns itself back on again.
im running the latest version of snow leopard and have a 24" iMac - white.
i made sure wake on ethernet was unticked
i have formatted and this problem persists.
i have even disconnected the ethernet cable just in case, still starts back up.
if anyone can suggest some things to try.

Hi j4y Gr4y
Reset the SMC > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
Then if it still starts up on it's own, you may have a faulty power button that needs to be serviced.
Dennis

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I have the same or very similar problem to those described in threads:
Link: [http://forums.computers.toshiba-europe.com/forums/thread.jspa?threadID=15325]
Link: [http://forums.computers.toshiba-europe.com/forums/thread.jspa?messageID=109125]
When I try to turn off my Satellite M100-165 ("Turn Off" in Windows or even by pressing the power button while I'm in BIOS) it turns on after a few seconds. It doesn't turn on when it works on batteries. It also doesn't turn on when I press the power button for 4 seconds.
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try use apple hardware test if is possible , 2 ways to launch AHT ( depend on your mac and system version )
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HTH
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Ah.. very interesting... I'm surprised I couldnt find any info on the 'net about this orange power light...
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Hello rameta,
It may help to reset your Mac's SMC and PRAM.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
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http://support.apple.com/kb/HT1379
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IMac won't stay shutdown, turns itself on after shutdown

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