New iMac 20 500Gb won´t start

I got my new iMac iSight 20" today. With the wireless keyboard and mouse and the 500Gb hd option. Great - if it would start.
First time I switched it on, I heard the Apple-sound, then the screen turned gray and showed the apple-logo. Forever. At leasts for several minutes. Then I switched it off, disconnected the power-cord and tried again. Now the screen won´t even turn gray, but after a while the fans runs like crazy.
Defective disc? or what?

I tried pushing the cd in, but it wasn´t drawn in.
This may sound obvious, but I just wanted to verify that you tried inserting the CD with the computer on. The drive should accept the disk as long as it has power.
If it is not accepting the CD with the power on, then you definitely have something interesting going on inside the computer.
I have had several macs since the 80s but this is my worst experience so far
For some reason the iMac G5's seem to be having more than their share of trouble. They don't seem to have the success rate that I am familiar with on Apple's other computers.
I've had two iMac G5's (purchased from Apple) and have had both of them serviced many times.
My recent one is only a couple weeks old, and was put in for service the same day it arrived.
But, with AppleCare I am sure I'll have all the bugs worked out by the time my 3-year warranty expires. If not, they can keep taping it together to get me through the next 3 years.
I am not sure why Apple's quality has seemed to slip. I have never had any trouble with any other Apple computer other than the two iMac G5 computers I have had. Even my first generation Mini is working fine with no service ever having been needed.
Sad when compared to the $400 Compaq I have. I purchased a Compaq PC for some other needs we have, and it hasn't had a single problem at all. It also had a very small profit margin for Compaq, so they didn't short me on the deal. It's a AMD Athlon 64 3400+. Basically, it's a 64-BIT system with a 2.4 GHz CPU that supposed to compare to a 3.4 GHz Intel (which it does quite favorably). It's fast, powerful (for a PC), and definitely more reliable than either of the iMac G5's I've had.
I also sold my 3 or 4 year old HP computer last year, and it put in a strong service life. The new owners are still using it without any trouble (I know them). And, it never failed once. Again, I only paid about $400 for it as well.
I've owned tons of PC's and the following Mac's:
PowerMac G3 266-DT
iBook SE G3 366 (Indigo)
iMac G3 333 (Lime)
iMac G5 (rev. A) 1.8 GHz
Mac Mini 1.25 GHz
iMac G5 (rev. B) 2.0 GHz
And, the only systems I've ever had fail have been the two iMac G5 computers.
So, Apple's quality control seems to have gone down where the iMac G5's are concerned. I wish I could say that they were as reliable as my PC's, but unfortunately the PC's and the older Mac's are rock solid by comparison.

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