Brand new 27" iMac will not sleep

I have a brand new iMac 27" and it will not sleep.  It just turns itself back on again.
I have the same hardware peripherals as I did on my 20" iMac.
I tried the energy settings, shutting off the wireless mouse, and I still can't get it to sleep.
I have read I can shut down "processes" but I'm afraid to as I don't know which ones to shut down and I don't want to mess up the system.
27" iMac
Processor:  3.4 GHz Intel Quad Core i7
Memory:  4 GB 1333 MHz DDR3
Graphics:  AMD Radeon HD 6970M 2048 MB
1 TB HD
Lion 10.7.1
EDIT:  I just tried to make it sleep by using a schedule and it worked.  It stayed asleep.  So what do you think?
Anyone?
I would really appreciate any help with this.
Thanks
Message was edited by: Paul131313

Try holding down command-option-P-R at boot time. Let it chime. Keep holding the keys down until it chimes again, and then release them, and see if it boots OK.
If that doesn't work, then power it off again, unplug it from the wall, wait 30 seconds, plug it in and try.
If that doesn't work, then reboot it, hold down command-R at boot, and try to get to the recovery partition. If you do, launch Disk Utility and try and verify the disk.

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