IMac won't boot. Black screen. What happened?

I can hear the HDD spin up, but there are no chimes.
The computer will take the install CD, and I can hear it reading it. Then it will spit it back out after 3 or 4 minutes.
I did the SMC reset five times back to back. I did the PRAM reset. Still nothing.
One thing that I can make re-occur is having the fans blast real loud by having the computer unplugged, and holding in the power button while plugging in the iMac. Once I release the power button the HDD spins up and the fans start going nuts.
If I turn off the computer, and back on again, it goes into the same 'loud fan mode'.
However, if I do an SMC reset and turn on the computer there are no more loud fans.
The computer has always ran flawlessly. I simply moved it to another room, plugged it in, turned it on and now this.
What happened?

rad_thundercat wrote:
I took it to an Apple store. They plugged it in I assume did a diagnostic. The guy said it's "probably" the logic board.
So these logic boards just go out?
Apple quoted $500 to fix it. I called a few authorized Apple repair shops around here to see if it was cheaper, but those guys were saying upwards of $950 and suggested to just buy a new computer :/
Yes, this can happen. Remember your computer is almost 5 years old now. These types of parts can last 1 year or 10 years. If you were in the habit of turning your computer off frequently that can contribute. temperature cycles are difficult on electronics.If you leave them on 24/7 they would last longer as the temp stays fairly constant. I have 2007 iMac that runs as well as it did when it was new, one reason is I rarely turn it off or power cycle it.

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