Imac is taking a deep sleep

I walked away from my Imac 24" Intel (white) yesterday and when I came back it seemed as though the Imac went into sleep mode (although its not set to go into sleep mode in my account).
Anyways I hit the space bar and few other keys also tried mouse clicks and the imac wouldnt turn back on. I also turned off the power (as the light on the imac was still on) and turned the imac back on (light came on, and fans humming). Still no display. I unplugged the computer pluged it back in turned it on and it didnt quite boot up, but it did turn on (light came on, and fans humming). Also at this moment i pressed the 'eject' button on the keyboard and the cd inside the imac came out. So its responding to my keyboard, but it seem as though the computer is in some sleep mode and is not coming out of that sleep mode no matter what I do.
Doesnt seem as though the computer is going through a full boot when I turn it on so I cant even put the CD inside hold down the key to boot up from the cd.
One other thing I pluged in an external monitor and there is no picture on there as well.
Any help would be greatly appreciated...

OK no one responded to my question, but I did take the computer to the Apple store today, they diagnosed and fixed the problem within five min.
Apparently the RAM died. Never heard of RAM just dying but that’s exactly what happened.
So if anyone has this problem try the PMU reset, which made the light in front of the IMAC blink which in turn indicated that this was a RAM problem.
Anyways I just like to clarify that APPLE ROCKS!!!

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