My iMac keeps turning itself on

When I turn my Mac off it re boots after 5 or so minutes, if i then turn it off it stays off.
It has been doing this for som time.
Any solutions

McUserSteve,
It sounds like a "wake on LAN" setting somewhere.
Wake on LAN will make a computer startup as soon as a LAN connection is detected or needed by a software.
Do you have eyeTV installed on your iMac?
If you do, then it could be the culprit.
Go to EyeTV prefs and uncheck the tick box that says something like allow network connection to wake computer!

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