Intel iMac power up automatically

Hello,
I have this problem since a few days. I shut down the computer normally and then, some minutes later, it automatic power on...
All the power options are disabled in System Preferences. The only change I have made to the computer is removing the bootcamp partition i created some months ago. I removed it with the bootcamp assistant so there shouldn't be a problem.
Any ideas? It's very annoying.
Thanks in advance.

Hola y recepción a las discusiones de Apple 
Go in to Macintosh HD > Applications > Utilities > Console. Inspect the system log to identify what action caused the Mac to turn on.
Common causes could be:
Energy Saver
Network access
EyeTV.
Navidad Feliz
mrtotes

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